First, I didn't like your math on that.

Second, hitting a baseball is not one of the hardest things to do, actually. It is a misrepresented statement that I hear all the time. Let's hold aside the fact that I don't believe swinging a bat makes you an athlete any more than swinging an axe makes a lumberjack an athlete, since my personal definition of an athlete requires both strength and fitness.
Having said that, almost every batter that steps to the plate in baseball hits the ball, which should in and of itself invalidate the statement. And if you are referring to "getting a hit" or "getting safely on base," the average pro is getting on base 1/4 of the time he is offered the opportunity through hitting and more so through the opportunity of walking or getting hit with a pitch.
There are a great many things that are harder in sports, such as a running back scoring a touchdown, a soccer player scoring a goal, a hockey player scoring a goal, etc. The baseball myth is just that; a myth.
That's why they call it the great American "pastime"....so you can "pass the time"...