The profit factor depends on many factors, you understand. The number of hands you play per session, your skill level, variance, and so on.
I think that your maximum profit will be equal to the average monthly salary of an unqualified specialist in a European country.
It is a grinding type of holdem. You have a lot more to the river playing as most of the time there are pot odds to stick around. Little slower to play but one proficient to the game should do very well.
"Luck comes and goes but knowledge stays forever."
I like limit because it prevents me from losing too much (but on the other hand prevents me from winning too much either). If you're skilled and the cards are dealt in your favor, easily a decent amount.
re: Poker & how much can you win per month, 2/4 limit poker
You won't make a single dollar playing low limit poker live in casino's. The rake is simply too high to beat. Don't waste your time. The minimum you would have to play would be 4/8 to see any type of small return and you must be good. A great limit player can probably grind out about 10$ an hour max play 4/8 limit kill. I would say maximum too. Your better off playing 8/16 limit or playing No Limit 1/3 - 300 buy in game.
Trust me you will not make money long run playing 2/4. I been playing poker a long time now and know all the specifics of every game, hourly take etc.