Also, a lot of folks end up carrying a balance in spite of their best intentions.
I suspect this happens relatively often even for folks with a long history of not doing so - e.g. maybe you get fired for the first time and start running up a balance, not long before you've run up some significant interest charges.
And then there's huge credit card bonuses like $150 for Chase Freedom which is like $7.5k of spending's worth...
But again, that doesn't really answer my question. I very much realize lots of people do pay interest. But there are also people who don't, and possibly never have, for many years. I'm asking why do they keep those people around as customers if they're literally losing money on them? To me the obvious answer is they're still bringing value, and the only realistic form that can take as I see it seems to be their transaction data.
https://www.magnifymoney.com/blog/best-of/10-best-5-cash-bac...
This way they'll make money after the limit takes effect. My assumption is that they are hoping the consumer will forget there's a hard limit to the amount they can save and always go with their "5% cash back card" when making purchases.
And that assumption is exactly what I'm saying isn't universally true. My entire point is there are customers who just rotate cards instead of still using it for lower cash back. Who do this for years. Without racking up any interest. Why do those customers' accounts get kept open?
If that's the case, and you can't predict who exactly that subset is going to be, you keep all of them around.
Fun fact: you can pay your US tax return with a credit card for a ~1.5% fee.