It depends on what I'm buying. I do pay by card sometimes if the amount exceeds a certain level, or if it's an urgent situation. Otherwise, it's cash. It doesn't take that much dedication -- cash is not that inconvenient.

What it gets me is a few less entries in the databases of the store, credit card companies, and the marketers who buy credit card information. Every little bit helps!

I never buy thing with a credit card, because I don't have a credit (or debit) card. Don't assume that everyone has the same options.