Just imo, if those threads are moved out of GM, there wouldn't really be THAT many threads left in here.
There would be all kinds of pointless threads you and your fellow mods allow to stay here.
Few examples that are on page 1 of GM now:
"Which actress do you think should portray your favorite in their biography movie?" - pointless/non-tennis
"Tennis Videogames Thread // EA Tennis Xbox360/PS3 version confirmed" - also non-tennis
"Vote the most "choker" player ever" - already done zillion times
"Will 5-Time Champs Roger & Venus Be seeded #1 at Wimbledon despite their rankings?" - no, pointless thread
"Nicole Vaidisova will win Wimbledon!" - crap thread, wishful thinking, again pretty pointless
"Wimbledon Qualifying Draw" - nothing wrong with this one, but shouldn't it be in the tournament subforum?
"Maria Sharapova and Serena Wimbledon Dresses 2009 (sexy!!!)" - player subforum
"Should the Williams Sisters be seeded 1 and 2 for Wimbeldon?" - no, nor they will be, again pretty pointless to talk about it
"Justine Singing!!!" - player subforum
... move or delete all these threads and voila... plenty of room for more interesting ones