This number was created by Polgar's lawyer using a time honored legal technique known as "pulling it out of your ass." Such a number has no conceivable rational basis. People should stop dignifying it with repetition.
She wants $25,000,000. That's fine. I want world peace, the Pittsburgh Pirates to win the World Series, and a night on the town with Jessica Alba. As a practical matter, nothing like this is ever going to happen in the real world.