Grinding or pay...I don't think everyone who plays the game see it as grinding. Absolutely no one is forcing a player to be bored with the game. That's what grinding boils down to, grinding is another way of saying "I'm bored with this game". If you don't hacking away at mobs for a long duration then the game isn't for you. There are people out there who are willing to play through these so-called tedious gameplay.

Personally RMT items should be purely cosmetic or have utterly no consequence of the player's ability to succeed or fail.