Hmmm...
For a typical low-limit holdem game, with a 5% rake, my understanding is that the long term win rate for a pro is about one big bet per hour. So, for example, if you could afford a $4-$8 game, your win rate is about $8/hour.
Once you move to higher limits, the rake (which usually is capped at $3/hand) is reduced as a fraction of the action, so your win rate marginally improves, but you can still think of the salary as being just a tad higher than 1 big bet per hour for limit poker.
However, personal style will greatly affect this. Although expert play gets you that 1 bet per hour, there is no "basic strategy" for poker, so your salary may come with high variance or low variance, making the bankroll requirements unclear. A person who gets into a lot of pots is going to have a higher bankroll requirement than one who plays very tight. Both styles can win. Without knowing your style of play, there is no way to say what bankroll gives what win rate in poker.
For further discussion of poker as a job, the salary, and the bankroll requirements, I refer you to the excellent poker website
www.twoplustwo.com
--Mayor