> "I'm not charged for using my own money" You are, you just don't know it because it isn't apparent. In fact, they want to make it appear that you're making money for spending money! Ultimately, it doesn't matter who bears the additional cost of using credit/debit cards, it results in higher prices for everyone and since credit card agencies prohibit differential pricing, it punishes people who pay cash.

Bitcoin still has a long long way to go and won't replace the existing system anytime soon, but definitely watch out for retailers who already provide a steep discount for using Bitcoin. That will be a good first step.