Because NIN is one of the most wanted classes. It's a business, hype is important, and NIN will hype more than just about any other class they could've released.

Join a Free Company or some Link Shells if you really hate the people this much. Personally, I don't have too many issues beyond the occasional troll, or new person who refuses to listen to advice.

I understand your frustrations, but there are ways to combat them.

On a sidenote, love your name!