system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:If I'm really good at using my credit card, do banks lose money?

As in, I make every payment on time, carry no balance, use rewards regularly, etc.
gpt
No, because banks charge merchants to be allowed to accept credit cards as a method of payment.  The merchant generally pays a small fixed cost per transactions, plus a percentage of the transaction cost.