Into the Night
Verified User
If you payoff your entire balance, every month, you usually get between 1% and 5% of whatever you spend back, and get a better return policy on what you buy. Basically, the non-credit card users are being charged extra, so people who pay off their balance can get a discount.
This is effectively an argument banks make to keep you running on tick. They make money out of it (in merchant fees).
Some merchants are rebelling against this, offering discounts to those that pay with cash. Many gas stations do this, for example.