I think a forum dedicated to any instrument, or genre of instruments in this case, is going to be a form of navel-gazing. Maybe looking at the same old navel all the time makes one a little stir-crazy.
On the OMB point, it could be that the four or five egos normally associated with a bunch of guys becomes concentrated in the one individual. Jeez, does that make us all borderline multiple personality cases? Maybe they'll start putting health warning stickers on arrangers. Yikes!