it's always like that.
Youre silly. LoL has been in the business of selling just skins, champs and boosts for real money. And they might be the biggest money making F2P game out there. Sheesh, the one thing they dont sell for money are runes, and those have a HUGE impact on how well a champ performs. You have to play matches to earn the IP in order to buy them.
So no, if LoL can survive and make mad amounts of money with out selling power, then MWO can too.