Do you feel Nexon exploits it's playerbase?

I thought this was obviously implied:
MTS is a way to work around buying NX with real money.

It's a way for myself personally to get around buying NX, but someone still has to buy the NX for me to do whatever I want with it.
In fact, with MTS's tax, even more NX gets purchased than if I would have gone out and bought a card for myself.

This the point you're not getting:
They've turned Maplestory into a game where NX is required to really participate in a lot of the content they're adding.

I feel this is turning into "The rich kids with NX are so badass and I wanne be badass too without spending NX. NYAH". NX does give an unfair advantage, but that's not the discussion.

Actually, the discussion is that NX gives a disproportionate advantage.
And you only see the discussion as being a whine fest because seeing it as anything else would require you to see the issue as more complex.

Fact still is every dollar given to Nexon is given voluntairily, so you cannot speak of Nexon "exploiting" people into giving them money.

Hey, look! It's a person who doesn't understand the concept of exploitation despite the fact that it has been covered multiple times in this thread!

Sure endgame is pay-to-play, but if that means Nexon is exploiting their players, then WoW is exploiting all their players too for making them pay to play their game.

Also already been addressed. Holy pomegranate dude, learn to read.