[VBCurtis]

Do you mean $1/2 limit, or a limit game with $1/2 blinds? I don't see how you can beat the rake and tip at a $1/2 limit game. If you beat the game for 15BB/100 before rake, you're making $30/100 hands. If you win 8 pots in those 100 hands (roughly 3 hrs of play), you'll pay $4.50*8=$36 in rake+tip. Net loss, $2/hr.

Even at $2/4 stakes ($1/$2 blinds), you need to beat the game for 9BB/100 before rake to break even. This is quite possible, but you need 12BB/100 before rake to make $4/hr at 2/4. That's a big number. Not an impossible number, but big. If the game is softer than 25-50 cent online (quite likely for 2/4), profit is possible.
-Curtis