Hey Nerdmaster!
That's actually the definition of the term "premium currency" - see Wikipedia's article on "Free to Play", for instance. (Account too new, can't link :()
> Another commonly seen mechanic is the use of two in-game currencies: one earned through normal gameplay, and another which can be purchased with real-world money. The second, "premium" currency is sometimes given out in small amounts to non-pay...
We also did a video of this game on Sunday, if watching us play and make inappropriate ED jokes is more your speed...