Everyone else is using credit cards, whether I choose to or not. I'm paying that price increase either way. I might as well get some benefit. It seems idealistic in an "I'm voting 3rd party" sort of way to think that by being stubborn I will change the whole system. However, if a movement began to gain traction towards cash-only purchasing, I might join it. I'm not under illusions about my own influence on the world - I have none.