I play poker and nitro is by far my favorite place to play bitcoin poker on. I would advice you guys that your rake per hand, that each player pays when in the pot is pretty significant. I think more players would play poker if you lowered your rake just a little bit. Also I would like to add that in order to get more people to play poker on your site, some poker specific promotion should be in place and would make wonders since your browser version of tables is very very good. Also with the rising price of BTC I would highly recommend you to think about adding 1on1 tables below 100 mBTC tables. I think alot of people would like to play lower, myself included.
Cheers