How much power is enough power?

At what point is it corrupt? Maybe greedy, but merchanting is an acceptable practice by nearly everyone in the free market, and there is nothing wrong with it, nor has nexon held any guards against it. There is nothing "corrupt" about it.
The only point I draw the line is when one person buys out all stocks of specific, high in demand items to resell at completely ridiculous prices because said person has full monopoly.

Well I guess you're right. But again I'm just saying that it can be corrupt as to how someone merchants rather than the fact that they merchant. There's a huge difference between merching regular items and duped/botted items. There's a difference between browsing the fm for something that's a very good deal and going out of your way to find people to deceive into buying/selling/underpaying/overpaying all day. I can't just say that any/every act of merching is absolutely normal when the entire economy of the game is as broken as it is.