Winnings in poker are measured in ROI(if you are playing tournaments whethere it is MTT or SnG) or in big blinds won per 100 hands.
Not by "games won".
This is due to that different tournaments have different buy-ins and different entering fee(rake). On top of that they have different payouts for the different places you finish.
If you win 50% of your games(other than HU) you, sir, are a millionaire.
If you play cash games, "games won" cannot even be applied.
Otherwise, yes, poker is negative sum, because there are fees(rake) involved.
Yup, I'm a poker player myself.
I was trying to keep my point simple. You have to win more money than you lose just to break even because of rake/transaction fee's.
There are many great comparisons between poker and trading, which is probably why so many poker players trade as well.
I suggest that traders (who do not play poker) consider two things: variance and your different skill levels at different types of trading.
In poker, variance is a wild thing. You could be a winning poker player and lose money for 2-3 months straight. You could be a losing poker player and win for 2-3 months straight. I've made 3k playing poker and have played over 100k hands and i'm still not convinced i'm a winning poker player (most of my earnings came from 2 tournament wins). I assume variance works the same way in trading... don't assume you're a good trader because you make a few winning trades.
My second point also applies to poker. I "think" i'm a winning player in multi-table tournaments, I'm breakeven at single table tournaments, and i'm a losing player at cash (over 10 nl). Each game is still texas holdem, but they are vastly different from each other. Different enough that I can win at one and lose at the other..
Once again, i'm sure the same applies to trading. Don't assume you're going to be a great forex trader just because you can successfully trade stocks and options.
Hope this helps!