Heh. Marc doesn't want you to have access to the powerful weapon he employs.
No, I'm serious. If you aren't a people watcher by nature, it's going to be extremely difficult to pick up on subtle cues your opponent is sending out while you are under stress yourself.
Conversely, if you aren't a math person, it's going to be extremely difficult to pick out and use all the probability matrices that go into the decision making processes on difficult plays. Especially if you are under stress.
Play to your strengths.
From my own experience, I doubt I could compete with most of you on a purely intellectual level. I just don't have a background in logic, math, etc. and I'm certain that I'm at the bottom end of the IQ bell curve on this site. If magic were simply the impersonal optimization of plays based on board puzzles, I wouldn't be competitive. Fortunately, this game has a slightly more personal nature.
I don't plan on doing anything to improve my math skills in the near future. I don't have the aptitude for it and with all the other things I'm involved in, trying to play catch up in that area is probably a waste of my time. Especially when I could be doing something that is either more relevant (like deck construction), or that I naturally have an aptitude for.
Again, play to your strengths.