Cash games, if the table isn't too crowded can be profitable if you get the cards. But your profit margin increases when the table gets more people at it. You can profit off of 9 other players, instead of say, 1,2, 3, 4, etc.
The down side of the full table is that there are 9 other hands you have to defeat to win the entire pot. So, it's hard to be the only person who has the nuts, and not have to split the pot.
A little observation of the action at the micro tables will help. If its a crowded table, and its really wild, bingo-crazy, go for it at your own risk.
If you want to conserve your bankroll, watch how the tables play, number of players, action, you will find your niche. It is not against the poker law to be picky, only play at your comfort level.