People always want more. Backes may have more money than 99.8% of people, but then he wants more than 99.9% of people. That might not even be greed. Backes is very involved in charitable work. Maybe he wants to donate another couple million to helping animals. Or maybe he also wants to set his future generations up for life, Now he needs to have enough money to keep pace with inflation. $55M (of which he has much less when you account for taxes, agent fees and living expenses) won't be near as much 70 years from now when his grandchildren are retiring.
Granted, if he hasn't spent a ridiculous amount, and given some prudent investing, he should be able to do that now. But why begrudge him getting a little more if that is what he wants? I never hear fans calling the owners greedy for wanting a little more and setting the salary cap where it is. The owners are super rich already, more so than the players. They don't need any more for their family. Why can't they raise the cap to give more to their players who have put their bodies on the line for them? Or why should the SUPER rich owners charge us poor fans so much for tickets when they have enough money to live comfortably forever.
If your company is paying you a living wage, why would you consider going to another company for a promotion and raise? Who gets to decide when enough is enough and you have to than start valuing loyalty over financial gain. Why does loyalty only go one way? Why don't we chide the super rich Blues ownership group for not offering their captain as much as a random other team would? At every level, people always want and are entitled to earn more if they can command it. That is the very nature of a capitalist society. What they do with it is not your concern. Whether they provide for their extended family, create 100s of animal shelters or swim in it like Scrooge McDuck, its their right to earn what they can.