Granted, some allow you to purchase new champions through in - game reward points earned from playing matches, but all of them can be bought with real money as well. (joystikrevolution.com)
What sorts of objects will players be able to purchase with real money in the game? (adweek.com)
However, once you start trading with real money on the line, this is when controlling your mind comes into play. (trendfollowingmentor.com)