"Often in trading there will be multiple winners per game"
Actually in finance everybody could be a winner... buy and hold an index for decades. Who would lose? There's no counterpart, nobody needs to be short in the stock that you're long. That's the key difference for me.
Of course poker does have commissions, aka rake.
Maybe you are talking about rake in biggest poker room(data at least 5 years ago)
Commerce(243 tables, 2400 employees) commercecasino.com
5 tables of $20/$40 LHE $1+$4, free meal
4 tables of $40/$80 LHE $1+$4, free meal
8 tables of $200buy ($3/$5) NLHE $1+$3+$1, no free meal, rebuy up to $300
110 tables of $400buy ($5/$10) NLHE $1+$4+$1, free meal, rebuy up to $600
3 tables of ($600<buy) ($10/$20) NLHE $9/HH, free meal, no jackpotdrop
LHE stands for limit Hold'em and HH for half hour.
I know a guy who cleans 1000$ a week playing 10$ buy in poker tournaments and he lost 1k$ trading, couldn't get a single profitable trade for some reason.
I think great traders make great poker players. Great poker players don't always make great traders.
A number of guys in the NFL can run under 10.3 100m sprint which would be pro sprinter level and would dust most college level sprinters. Usain bolt wouldn't last long on the football pitch.
Similarly I think more things from trading are applicable to poker, than poker is to trading.
I know a guy who cleans 1000$ a week playing 10$ buy in poker tournaments and he lost 1k$ trading, couldn't get a single profitable trade for some reason.