Yea, keep a revolving balance on there. But don't go out and get more cards, because then too many revolving balances are killer for your credit. My worst/most fun card was my Victoria's Secret card. I could use it at Express and Bath & Body Works. So of course, I'd shop them. MORE than regulalry. I'd buy stuff for everyone at these stores. And good ol' Vicky's raised my limit practically every single month. So I'd racked the shit out of it, pay some off every month. Then pay it off every 5 months or so. It was fun. But I'll never do this again!