It’s not just salary, the player that returns United to former glory will have their name etched in the history books. So it’s also a big legacy chance, if he goes to Madrid and wins a CL it wouldn’t be like winning one for United after 10 years of mediocrity. Also United is probably the only club on Madrid/Barca level when it comes to brand power. So no, it’s not just salary. But ofc the sporting aspect is weak as the project at United is to put it frankly, shit.
His 2 WC campaigns make him an infinitely bigger name than Haaland lol. You’re completely deluded if u think Haaland is a bigger name than Mbappe. WC is much bigger than CL.