He might like Money but he also does have a brain. Playing one season in the Saudi league might cause him to derail his career, right?
I am pretty sure that Real Madrid has some kind of agreement with him at this point.
At the same time not having any great striker, will approach him, it only makes sense.
But yes I understand what you are saying. The Saudi clubs are still going to go after him. Maybe they will offer him something even crazier this time.
Mbappe this time seem to be keen on building a career record which will in the long term be something he can always look back at and be proud he was able to achieve that much while he was still your and in his prime in his career then probably get to chase the money again whenever he getting close to retirement but in the main time his career architecture matters the most at this time because back there in the Saudi league he will get to make some good money but his career record wouldn't be beautifully decorated probably as much as he may desire it be but then at Madrid it's very possible he will get the opportunity to get the dream career he wants.
At Madrid all the platforms and the opportunity for elite leagues will be made available for him and the dept of the team is an advantage for a quick advancement in his career he was actually able to win the world cup at a very young age which he can say nationally he's peaked his career but in the clubs he needs some more decorations with trophies and other personal records which will make him have a fulfilling career so the opportunity at Madrid is just so much that I doubt he will heed that advise to moving to Saudi instead of the Madrid dealing.