When I was playing a couple years ago I was using an old computer which could pretty much run UT. I got a new computer after the last MLSG and then I could play other games and stuff. I think a did a few PUGs, then disappeared. I'd check into the irc channel every now and then after that but it was mainly filled with idlers.
I'd come back to do a tournament though (pending a cooperative schedule) because it's fun. Maybe some of the other players that have left would think the same thing.