How I Made 50% in 30 Days Flipping Baseball Cards
Most collectors chase hype. I look for mispricing — and it just paid 50% in 30 days.
Baseball cards have long been a passion of mine. I remember going to Walmart or Target with my mom and the adrenaline rush of picking out packs of cards.
Football and Pokémon cards were big for us too, but baseball has always been what I loved. After the age of ten, I would say I got disconnected from the hobby. Back then it wasn’t exactly cool to be opening packs of cards while you were in junior high.
In 2023 a friend of mine had started selling cards on eBay. Hearing that people were still collecting cards, let along making money with them, was like seeing electricity for the first time.
I jumped back in, hardcore. Grace was about to commit me to a mental institution at the rate that I was buying cards. Early on, her concerns were valid. I was buying cards with zero strategy and losing money most of the time.
Thankfully, at that time, I was not buying big items. When I say that I lost money, we are talking $10-15 here or there. Losing $10 when you spent $20 is still losing half of your money though.
My first big purchase was a Shohei Ohtani rookie card in PSA 10 condition, which means gem mint, for $185. Two months later I sold that card for $350. Ever since that day, I haven’t looked back.
This week, I sold two baseball cards that I traded for less than 30 days ago for a 50% return on my money.
Today, I’ll be sharing with you how you can identify hobbies that you are both passionate about and experienced in to achieve similar outcomes yourself.
Go Narrow on What You Know Very Well
Now that I have you convinced that I’m a sports card savant, I’ll share with you how I’ve lost my shorts buying things. Then you’ll realize I’m not that special and anyone can do this.
Here is a list of the sports that I’ve lost more money than I’ve made when it comes to card collecting:
Basketball
Football
Hockey
What’s the common theme in all three of these sports? I do not know the market for them, at all.
Basketball and football collectors have a completely different mindset and the way their markets move is way more volatile than baseball. Hockey, well that’s for the Canadians.
Whether you’re into sports cards or not, this principal can apply to anything that you’re into (watches, cars, art, etc.).
There’s only so many things you can be an expert in. The jack of all trades is the master of none.
Using myself as the reference, I learned the hard way that trying to do too many things at once does not work at a high level.
Here’s what would happen. I would make $200 selling a baseball card. Then I’d turn right around and lose $300 trying to do the same thing with a basketball or football card.
After putting my hand on the hot stove and getting burned a bunch of times, it finally clicked that maybe I should just focus on the thing that I’m consistently getting results from.
You have something that you know extremely well yourself. In a world with unlimited possibilities, you too will be tempted to chase the lady in the red dress down the street.
Staying narrow on what you’re extremely knowledgeable in is the first step to making money.
Track the Market for Whatever You’re Purchasing
In 2026, anything with legitimate value has a marketplace. There are ways to track the values of cars, watches, sports cards, you name it.
I personally use what’s called Market Movers for my sports card collection. Just like this image below; it will tell me the current price of a card, how much it’s gone up or down, the total population at a certain grade, and more.
Side note, this card is on my 2026 vision board. It’s not in my collection yet but it will be soon.
If you do not have a way to track the values of what you will be collecting or selling, I would not suggest that you attempt doing so. Would you ever buy an investment, business, or real estate without knowing how it compares to the overall market?
By tracking and understanding the market that you’re knowledgeable in, you will be able to quickly spot buying and selling opportunities. This reduces some of your risk and enhances your ability to turn a profit quickly.
Most marketplaces, like eBay, have pricing history that you can use to track the price of things for free. If you’re getting serious about collecting or selling, most categories have apps where you can pay a subscription to track the data.
Market Movers costs me $20 a month but it’s worth the investment. The ability to make informed decisions quickly pays dividends.
Only Buy Things That You’re Comfortable Not Selling
This one took me a while to learn.
Early on, I was buying cards purely because I thought I could flip them fast. The problem with that mindset is that when the market moves against you, you’re stuck holding something you don’t even want. That’s a bad place to be.
The rule I live by now is simple. If I couldn’t sell this card for the next two years, would I still want it? If the answer is no, I don’t buy it. If the answer is yes, I buy it with confidence.
The Ohtani rookie card I mentioned earlier is a perfect example. When I bought it, I would have been thrilled to hold it forever. It also happened to double in value in two months. That’s not a coincidence. The things that are worth owning are the things that are worth holding.
This keeps you out of panic selling too. If you bought something you genuinely love a temporary dip in the market doesn’t rattle you.
You know what you have. You know the market will come back. You can afford to be patient, and patience is where the real money is made.
Buy things you’re proud to own. The profits tend to follow.
Don’t Be Greedy
The market for anything moves. What something is worth today is not what it will be worth in six months.
Players get injured, trends shift, collectors move on, and the market adjusts. The same is true for watches, cars, art, or whatever your thing is.
This is where most collectors leave money on the table. They fall in love with their collection. The card that doubled sits in their case because it means something. Even worse, is when you are thinking greedy that it will continue to go up.
Here’s what I’ve learned. If I can hit my number, I move it. I can always buy back in on the next opportunity. Money sitting in a card that already peaked is money I could be putting to work somewhere else.
The two cards I just sold for 50%? I liked those cards. I still moved them.
The goal is to keep compounding your returns in a market you know better than almost anyone else. With those returns you can reinvest into items that you truly love and desire to hold long term.
Heroes Coffee
Getting back into collecting, I had a lot to learn. My morning ritual at the time was that I would wake up and go to the gym and then drive over to Heroes Coffee in Rogers, Arkansas to read books on sports card collecting before I started working.
Given that this is a post about making money from many of the things I read about in their shop, I feel like it’s timely to shout them out.
I’ve always enjoyed Heroes’ Costa Rican roast or their Black Satin. The Black Satin is a darker roast, but it is extremely good, especially paired with cream.
My recommendation would be visiting their Pinnacle Hills location in Rogers. It has very unique indoor and outdoor seating in a beautiful part of town.
Drink local, cheers!
Disclosures:
This blog contains general information that may not be suitable for everyone. The information contained herein should not be construed as personalized investment advice. There is no guarantee that the views and opinions expressed in this blog will come to pass. Investing in the stock market involves gains and losses and may not be suitable for all investors. Information presented herein is subject to change without notice and should not be considered as a solicitation to buy or sell any security. Revolutionary Wealth LLC does not offer legal or tax advice. Please consult the appropriate professional regarding your individual circumstance. Past performance is no guarantee of future results.