So as a former EVE Online player and major economist from that game, I can say that this so-called "economical destruction" has never occurred in EVE Online even though PLEX prices are currently pretty damn high. But not once has it resulted in the "creation of currency." What the system does is you have someone buy an item that is sanctioned by the developer as fair (PLEX in EVE for example) with real money. That person sells that item on the market for in-game currency and when it gets bought, the seller gets another player's currency. It is never generated by the system. In EVE, this item can then be used by the buyer to extend their subscription to the game. It's not creating currency nor is it destructive or "pay-to-win" in any way. To all those who argue that it is, I suggest you check out EVE's PLEX system. It is a fine example of how to implement a feature like this without breaking the game.