Never for truly big ticket items, but sometimes the $5 or whatever in interest to carry a small balance for a month isn't worth the extra effort it would take to free up the cash I'd need to pay it off in full without dipping below the minimum balance I like to keep in my checking account, and it's also not worth $5 to me to wait another month before replacing that busted transmission.
It depends on the matter of scale. Some folks either don't understand how things work, or are just bad at math. That's where the problems start for people.
Never for truly big ticket items, but sometimes the $5 or whatever in interest to carry a small balance for a month isn't worth the extra effort it would take to free up the cash I'd need to pay it off in full without dipping below the minimum balance I like to keep in my checking account, and it's also not worth $5 to me to wait another month before replacing that busted transmission.