Sometimes it just isn't possible to help on stuff like this - I work full time, have a small son to look after and am making several of my own games - plus I like to get out on the bike about 3 or 4 days a week to try and maintain my sanity...If I was just bumming around then I'd definitely chip in, but it's not realistic right now - I'm sure similar reasons prevent a lot of other artists and coders helping out too.