Credit Card Tip Promo

Not sure how this would work, but it is common knowledge that when you use a credit card (CC), a percentage of your transaction is collected by the CC company. Different companies collect different percentages, but generally, its between 2-4%. How would a promotion work in which a given CC company decides that the CC company will not charge for tips. Now this wouldn't translate into too great a reduction in revenue from CC purchases, but, if publicized well enough, it could change people's preferences regarding what card they use in tipped services. Externally conscious people would start using this particular card when eating out, getting haircuts, and other such activities. Eventually this preference may carry over into everyday purchases.

I know most people don't care about others, (what have u done for ME lately) but this could possibly become a subtle way of showing that you care or to make a good impression on others...