Took a look at the Nexon "careers" page

MWLB died the day it began they did nothing useful, made no difference in the game.

And why do you think that is?
Here's what I'm seeing here as qualities that were offered by them

• Extremely involved and engaged in the game, somewhat directly benefiting from their work by having each other's servers purged of filth
  
• Actually know the ins-and-outs of the game, hacker hot-spots
  
• Free labor
  
• Gullible / obsessed enough to actually do it for free
  

But it looks to me like something like that would just open up the floodgates for reports, and the GMs who actually review evidence and issue the bans would be swamped.