[Paluka]

I work for Susquehanna (now in New York but originally in the Bala office), so I have some insight into some of these issues.
I believe that Jeff and the other partners believe that while poker skills do not directly translate to trading skills, there is still a lot of overlap in the thought processes. Risk management, bias recognition, game theory...Just forcing yourself over and over again to really think about where your edge is coming from is a useful exercise.
I can also agree with the posts that say that market making and short-term trading is very different from long term investing. Game players are much better suited for the former.