I used to buy the stereotype of the smarter than average jew, I guess the moral of the story is don't believe stereotypes.
First a player is worth whatever the market deems him to be worth. I hate Mino as much as the next guy, but he does have a great point - footballers, who seem absurdly rich to us, are just the easiest way to see value in real terms. There are people out there that buy those footballers, just like I am buying a sandwich - something for the day to do. They are buying moviestars, singers, models, etc. like they are on a promotion.
So if you think 100M Euros are a lot of money - you just don't get it. You cannot call a lot of money an average yearly bonuses for a few mid-level lackeys. They aren't owners, even if they are some CEOs they are an expensive hand-for-hire. Just like landowners did to labour before. Even if 99.9% of the population will never get to touch 100m in their lifetime, that is still not a lot of money - as a simple football transfer shows.