<prompt> Human: Whats the catch with having a lot of unused credit cards?Im thinking of opening a 0 intro APR credit card and using it until the intro period is up and then just opening another 0 intro APR card and using it until the intro period is up and continue ad infinitum.It seems like a good way to have an unending interest-free credit line but Im sure theres a catch. Would it hurt my credit score to have so many unused credit cards? Will the companies close my account if I dont use the cards? Whats the catch?  <response>: Whats the catch with having a lot of unused credit cards?Nothing, though it might get you declined for certain cards if you applied to too many in a short period of time. then just opening another 0 intro APR cardCredit cards dont have interest if you pay everything off in the statement balance, you dont need 0 APR cards unless you plan on carrying a balance which nobody here will tell you to do. 