ice - if you play $100/$200 6 max even sites with 1k players usually have games going.
When I first started there B2B often only had 2000 players up but could have up to a dozen $100 6 max open.
PokerShare had plenty of 6 max games last night - for the smaller rooms I think it just depends on the site and time of day to be honest.
One of the main reasons I switched to 6 max was the availability of games on the smaller sites..
That said I've no idea if Tain are any good - but it's another network for me to explore and they have given me free money to start up with so it seems rude not to try to run it up as an experiment!