It won't end up being 250M, but I totally believe it is the starting point of negociations for PSG.
Madrid has a little more leverage than PSG here... but considering we were burned last time we thought we had leverage, Perez might be a little nervous and pay a ridiculous fee. As much as I love Mbappé, I would not wait for him if I were Perez. Either the fee makes sense to Madrid or you turn around and go after Kane or another CF... or you run with what you have and hope to get Mbappé on a free... but that's very risky.