like x miles per dollar spent Sounds simple? Well it isn't, and it has already been tried. The exploiters will spend a lot of money - on buying money. They wil

like x miles per dollar spent Sounds simple? Well it isn't, and it has already been tried. The exploiters will spend a lot of money - on buying money. They will buy gift cards and other such things which can easily be converted back to cash. These kinds of marketing exploits happen everywhere. I remember a nice local event where a mobile carrier offered pre-paid SIM cards at a great discount. People hoarded all these discounted SIMs immediately. Used them to transfer money to some web services (some services offer pay-by-mobile, where the charge is added to your mobile bill). Then proceeded to withdraw the money to their bank accounts. A pretty nifty way to make money.