See, the credit industry makes money not only off interest, but they also scoop up 2.75% + $0.35 in fees for most transactions (on average)... in the United States
(interest still applies to the rest of the world though)
It's easy to say that someone should use a crappy service (eg. PayPal) to handle money if you're never going to use it yourself. I don't see anything seriously wrong with the point system, except you should be able to convert it to real money and send it to your bank account.