Interesting.
Could well imagine that gaming skills come in handy if your style is heavy-metal scalping, doing hundreds or thousands of roundturns / day.
I do believe that there are a select few who make a good albeit not compoundable living at that, but I'd assume that for most traders scalping is just a quicker way to the poorhouse.
On the other hand I suppose that teaching their incoming crop of newbie traders a churning trading style that generates massive commissions is probably the main source of income for quite a few prop trading firms.
That's just my opinion though, I certainly don't have any hard facts on how many traders at prop firms are net profitable, or, of those that are, what kind of a living they can make there.
Be interesting to hear some insider info on that.