Also, he's paying double if he's pays the loan off each month
Wut? How?
You used a credit card, which is a loan, to make a purchase. You then paid the loan off before they charged you interest.
You think you are beating the bank at their own game (3% cash back on grocery purchases, which is a joke compared to what they'd charge you for carrying a balance), when in reality, they know you are paying twice.
I pay once, get the 3%, and live happily ever after. You're not making any sense. There is no "they would", because I don't allow them to charge me interest.
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