It'd be nice if all money was donated to charity, but that's not really the way the world works. He can use it for content, thus it's putting food on his table and the table of his employees. Even if he didn't, people that are well of are allowed to buy nice things for themselves. He's stated that he does donate to charity, and doesn't feel the need to discuss such things with people who's business it really isn't.
Not sure why you seem to think his child's college wouldn't already be covered. He likely has education funds already set up.
It's his own money, for his own