As the son of a retired police officer and a big supporter of public employees, it does bother me but if the entertainers (which is what pro athletes are as well) weren't making that money, the owners (either stockholders or proprietors) would be. Also, in the case of athletes especially, you have to remember they are among the top 30 people in the world (to get into the $40 million per year range crossing all sports) with their skills. How much do the top 30 surgeons in the entire world make? Probably not $40 million per year but I'm sure it is a multimillion amount.
Finally, if you could do something better than billions of other people, and people were willing to pay your employer to be allowed to see you do it, how much would you want to be paid to do it?-- Rob