How to Calculate Real ROI on Cards
The purchase price is only half the story. Here's how to calculate the real ROI on a card once shipping, fees, and taxes are counted in your cost basis.
Disclaimer: Everything in this post is my personal opinion, shared for information and entertainment only. It is not financial, investment, or purchasing advice, and nothing here is a recommendation to buy, sell, or hold anything. The card hobby carries real financial risk, so please do your own research and make your own decisions.
A card you think you "made money" on can quietly be a loss once you count everything. The purchase price is only half the story, and ignoring the other half is how a lot of people fool themselves into thinking they're up when they're really breaking even.
To know your real return, you have to look at your all-in cost on one side and your true net proceeds on the other.
What actually goes into your cost
The price on the listing is just the start. Your real cost usually also includes:
- Shipping you paid to receive the card.
- Sales tax.
- Any grading fees, if you graded it (submission, shipping both ways, upgrades).
- Supplies, if you want to be thorough.
What you actually net when you sell
On the other side, your sale price is not what lands in your pocket. Out of it typically comes:
- Marketplace fees (on eBay, often around 13% or more once you include everything).
- Payment processing.
- Any shipping you cover for the buyer.
- Taxes where they apply.
A quick example
Say you buy a card for $100, pay $5 to ship it to you, plus tax. Then you sell it for $130. After roughly 13% in fees (about $17), plus shipping and supplies, your net might land around break-even, even though the sticker looked like a 30% gain.
Why it matters
Knowing your true cost basis, the all-in number rather than just what the card cost, is the only way to know if you're actually ahead. It's the main reason I keep records of the full number on every card instead of trusting the purchase price.
Conclusion
If you sell even occasionally, run the full math before you celebrate a flip. This isn't advice on what to buy or sell, just a reminder that the real number is almost always different from the one you remember paying.