Nice rationalization, not based on facts. It costs the merchant 1 1/2 to 3% per purchase.
How credit card fees for merchants work | The Star
It's your opinion that it takes less time for a CC transaction; I have yet to see that happen. Computers aren't that fast to begin with but sometimes they are extra slow, people's cards don't work, they just feel like flirting with the cute store clerk,or they just can't decide what stupid scratchoff they want. OK, the latter two have nothing to do with what you're paying with.
A few years ago I was trying to get someplace but had to get gas using the company credit card. After filling I encountered a long line; that particular chain reboots their computers at 7:30 every morning when the main office opens, so everybody paying with a credit card including me had to cool our heels for 15 minutes until they were ready- and while I always carry enough cash to cover my own purchases, even when using a card, I didn't have enough to pay for 20 gallons of gas. Needless to say I don't stop there anymore.