I agree with Mebs, sounds dodgy. APR on a credit card is 18.5% or more? Savings accounts are less than 5%? Unless you're talking about becoming a hardcore dealer of nasal decongestant, it's not likely you'll get the returns you need. No harm in reading about it and seeing if there is some way to turn 5k into, say 7.5k quickly without going to jail. Using a credit card, you'd get 1.5k out of that deal. If you were able to get a loan from a credit union, the interest would be lower, and you'd get more back.