There is a huge difference between game theoretic optimal strategy and actual profitable strategy due to the human nature of the players. I imagine a professional poker player as someone who certainly knows the odds (math of the poker game in general), but is also very good in interpreting his opponents behavior (which would minimize the information revealed by them, but could they do it completely?). There are so many biases which even professional players have to overcome, that in my opinion poker is strongly psychological game. Also because of that I think that online poker and live poker are slightly different games.
