I just simply can't comprehend that line of thinking. Some company is offering to pay me several hundred dollars a year for paying one easy automatic monthly payment (from my debit account), without charging me interest, and somehow that's a bad deal?
I understand the people that have no ability to control their spending, but I stick to a strict budget, and the money is going to be spent either way each month. You are actually decreasing your wealth by using a debit card.
This is not some sort of gimick, for every $7,500 I spend I get a check for $100. When you spend $7,500 you get jack. There is no argument that could ever prove that $100 check is worse than $0 for the same money spent.