I can see ilmc92 frustration.
He's been here for a year and been loyal to one league only for that duration. He may have put a lot of time into his team and MFN throughout the year. If he abandons his team and moves to another league, what's to say he has to go through that all again. Especially other leagues that are low on GM's.
And if GM's leagues aren't simming for whatever reason, they may loose interest and move on. I'm not sure what the answer is, but this could be an area where there is an opportunity to retain some GM base.