You swipe the card. 2% cash back. Nice. $1.40 on that $70 grocery trip. The points add up. You feel like you're beating the system.
You're not beating the system, kid. You're the system's best customer. Let Venny show you why.
How rewards actually get funded
Every time you swipe a credit card, the merchant pays what's called an interchange fee. Typically 1.5% to 3.5% of the transaction. That fee is split between the card network (Visa, Mastercard), the issuing bank (Chase, Amex), and — in the form of rewards — you.
Where does the merchant get that money? They raise prices. For everyone. Including the 29% of Americans who pay with cash or debit.
A 2020 Federal Reserve study estimated that credit card rewards programs transfer about $15 billion per year from cash-paying households (typically lower-income) to reward-earning households (typically higher-income).
The invisible tax
When you earn 2% cash back, the grocery store didn't give it to you. They already built it into the price of milk. The cash-paying customer behind you in line funded your reward. You didn't beat the bank. The bank just pitted you against the cashier in front of you.
The part that actually hurts you
That's the moral problem. Here's the financial one.
Studies show people spend 12-18% more when paying with a credit card versus cash. Why? Because swiping doesn't trigger the pain-of-paying response in your brain. Cash hurts. Cards don't.
Now do the math. You earn 2% back. You spend 15% more. You are net negative 13% compared to if you had never had the rewards card at all.
And that's assuming you pay your balance in full every month. The moment you carry a balance, the interest at 24% APR wipes out a decade's worth of rewards in a month.
Who rewards actually work for
Venny's not going to tell you rewards are evil. They work — but only for a very specific person.
- You pay the balance in full. Every month. Automatically.
- You do not spend more because you're earning points.
- You actually use the rewards (40% of points expire unredeemed — that's pure profit for the bank).
- The card doesn't have an annual fee that cancels out what you earn.
If all four are true, rewards are a legitimate 1-2% discount on life. If any one of them isn't true, you are paying the bank to feel clever.
The sign-up bonus game (this one's legit)
Here's where I'll cut you a break. Sign-up bonuses are actually the one place rewards math works in your favor — if you play it right.
A card offering "$200 after you spend $500 in 3 months" is a 40% return on your spending. Banks offer them because they know a chunk of people will carry balances after and make it back. If you don't carry a balance, you just won.
The cash-back card Venny actually carries
If you're in the camp that pays in full every month and wants the points without the annual-fee games, this is the one. Flat 2% on everything, no categories to track, decent sign-up bonus.
See the card →The travel-card trap
Travel cards are the most seductive trap in the rewards world because the math gets fuzzy. "Points worth up to 2 cents each!" Up to. In practice, most redemptions are 0.8-1.2 cents.
Annual fees of $95 to $695. Spending requirements to "unlock" benefits. Transfer partners that change. Blackout dates. Award availability that requires booking 11 months out at 3 AM.
The people who genuinely win at travel cards treat it like a part-time job. They're great at it. Most people who have these cards in their wallet are subsidizing those people. Don't be the subsidizer.
Venny's travel card pick
If you fly 10+ times a year and will actually use the lounge access and credits, this one earns back its fee. If you don't, get the flat-cash-back card above and keep it simple.
See the travel card →The Venny rule
Rewards are a tool. Tools are neutral. A hammer builds houses or breaks windows.
If you're disciplined, rewards are a 1-2% coupon on life. If you're like most people, they're a 15% spending premium dressed up as a discount.
Know which one you are. And check your statements. The reward math doesn't lie — your brain does.
— Venny