Earlier quoted context omitted.
Then those young US friends were idiots. I only know people who use credit cards to get 2%+ back from their purchases, plus an interest free 20 to 45 day loan. If you're spending with a credit card more than the cash you have on hand, then you're doing it wrong. Obviously, there must be some cohort of people that pay interest, but there's no reason anyone with half a brain can't setup up autopay and earn the cash bac…
Why were his friends idiots? They could have been doing exactly what you described
I apologize though if I read it incorrectly the first time.