You're being pedantic about it; if Harry Shearer is bringing enough value to Fox for him to paid $300k an episode, then he "deserves" it the same way a star athlete, who generates millions of dollars for his team's franchise, "deserves" the exorbitant salaries they make.
"Deserves" is really otherwise a very subjective term - and just because you don't think someone "deserves" something doesn't mean they don't, so it's pointless to argue about it.
So, Microsoft changed the UI of Office because otherwise people would have stopped using it and started using OpenOffice or something else?
Yes and no... in reality, people would have kept right on using MS Office, but perception is reality - software companies, like MS, think they have to keep "innovating" in order to stay ahead. If they sit still, someone will pass them by... it's not true in this case, but that's the perception. It IS true w.r.t. the OS, but that doesn't mean the GUI needs to drastically change.