1. If you could employ someone for £50m a year who could earn you £60m a year, would you do it? Many would.
2. If someone would pay you £50m for doing something you can do really well, would you do it? Many would.
This should answer this for you.
I have zero interest in football, and, zero knowledge of football.
However, many years ago (in the days when Alan Shearer played for Newcastle United), in the pub with several of my Brothers-in-law (all avid football fans), there was discussion on the (then) obscene amount he was paid. Bored with not being able to contribute, in a football way, I presented exactly that argument, ie, if he attracted enough (paying) spectators, sponsorship etc etc, then, there was a business case for paying that amount, whatever it may be.
I have not been invited to any football related pub sessions since