With Mbappe leaving, the whole Real Madrid situation will become very very different. The rumours so far is that Real already gave him an offer, it is already at Mbappes hands, Fabrizio said it himself, but the offer is much much smaller than what he would get or even getting right now at PSG.
This means that Mbappe would have to accept an offer that would be significantly less than what he is getting right now. Which isn't really that weird, that dude could go to Saudi Arabia and make 200 million a year at least, and for 10 years as well, he could sign that deal TODAY if he wants to. That means you say no to money in right situation, is PSG one of them? Would someone else offer more than Real? We have no idea what will happen.
That is the risk that Mbappe has to accept, there is no harm in offering a smaller salary because Madrid once offered a bigger salary but Mbappe immediately rejected it. So the bottom line here is if Mbappe only focuses on money, just go to Saudi Arabia and Madrid won't stop him. But if you want to feel what every European player who wants to be in the Madrid squad wants to feel, then follow Florentino rules. The situation turned around and it became a lesson that Madrid is not a submissive club like PSG. For Florentino, star players can be sought, but for Mbappe, the opportunity to go to Madrid only requires saying "yes". Money will follow if it is able to show the results that Madrid expects. Mbappe ability is ultimately no longer about money, because Madrid is more than that.