Not really. I can consider it if I want. But it's not required and not even necessarily the norm. It's a nice social impact, but hardly justifies the wages. If it did, then we should be giving those wages to the organizations that have the greatest positive impact on our communities, rather than athletes.
I won't argue with the market. But I don't buy the "give back a portion of my millions" argument either. Heck, give me a million and I'll see to it that 95% goes back to the community or to help with world hunger and poverty. I'll buy you a ticket to the Super Bowl too!