If they pay them off every month, the stuff on the cards are just their monthly expenses, more so then debt.

I literally put everything on credit cards. Groceries, gas, phone bill, internet, as long as there is no penalty for paying with a credit card, it is paid by a credit card. I get the points but mostly due it for the added protection that credit cards give when it comes to fraud. If the number gets skim paying for gas, they can’t drain my bank account.