Depends on the individual. I don't need £150m, I do well and am set for mine and my children's generation. I've turned down opportunities that would have been life-changing in my life. I've been at Because, I take pride in making money with a clear conscience.
Beckham's are already set for the next 10 generations. This makes him accepting something like this worse. After all, it is a regime that contradicts his earlier affiliations -
https://www.unicef.org.uk/celebrity-supporters/david-beckham/.
Maybe you would accept something, which is fine. I wouldn't judge you because you're not partnering with Unicef or trying cultivate a goody goody image. But seriously, many people have principles and wouldn't accept certain things, regardless of money.