But that's just "there's money; I should have some", which is understandable, but doesn't have a good enough grounding in reality. More fundamentally: there is a market for talent. If no other artists are willing to work without this benefit then one of two things will happen. Either this benefit will be added to artists' contracts, or the projects won't happen in the first place because they will never make enough money to be worth the investment.
https://en.wikipedia.org/wiki/Namco#Financial_decline_and_re...