Cash from credit cards for downpayment

[Reggie Dumont]

I was recently in conversation with a fellow investor who just started out, He explained his strategy for buying low cost multi-families is by using cash from credit cards when they offer o% for 18 months or whichever time period. Once he closes on his home, he uses a portion of the monthly profits to pay the credit card off, and if the balance exceeds the 18 month period prior to interest kicking in, he does a balance transfer to another credit card. is this a good strategy? Im assuming there's risk, depending on how much you can borrow and ensuring the income from rentals will cover.

Any comments on this?