Because "parlor tricks" are only the first step. If I can influence dice then I will go on from there. "He who acquires power quickly is the first to perish." A little dramatic maybe but still true. I don't want to bite off more than I can chew.
So are you implying that if one does not do parlour tricks at the beginning of his path as acquiring power too quickly? I disagree.They are simply studying a more useful subject.Related subjects to those you mentioned are very..useless in my opinion
I personally could not see how one can go anywhere in progression from such study , so if otherwise , please enlighten me.