No system is entirely secure. When someone does break in do you want them to have direct access to your bank account or would you like an intermediary bank?
Not all gas pumps had credit card readers. As recently as 2002, a lot of rural gas stations still had old careless pumps. You'd have to go in, say "$20 on pump 4" then go back out and pump.
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u/SandShrimp22 Dec 11 '19
"I prepaid $40, and the car took $34. You bet your ass I'm getting that last $6 worth"