Ask a simple question, get a simple answer: no. The reason credit card companies are willing to give customers rewards/cashback is that they’re competing, prim

Ask a simple question, get a simple answer: no. The reason credit card companies are willing to give customers rewards/cashback is that they’re competing, primarily for interchange revenue. Most cards are guaranteed to be profitable for the issuer (ex-credit risk); some models (5% rolling category up to $75 back, etc) are not strictly guaranteed to be profitable, but they’re running a portfolio strategy. You don’t need to make money on every account. You need to make money on every pool of, say, 100,000 accounts. One could conceive of rebate schemes poorly designed enough to not do that, but the industry broadly doesn’t ship them. There are people who make hobbies off of attempting to get the financial industry’s sweet sweet marketing dollars. The financial industry can afford an infinite number of business analysts and geeks. The marketing dollars are still on offer. What does this suggest to you as to the portfolio-wide impact of hobbyists who exploit the offers?