<prompt> Human: I have a credit limit of 5.5k on one of my cards. I have an offer to transfer balance from it with 0 interest for 18 months. Why shouldnt I put that money in an investments account and grow it a bit, then withdraw it and pay it all back during the last month?EDIT: I know this is a bad idea. I just dont know why.  <response>: Theres no guarantee youll have 5,500 in that investment account in 18 months. 