Joining Madrid shirt is like wearing Balenciaga, pla,yers care about the " brand " a lot.
And when you join Madrid, you guarantee that you will win a lot of trophies & play with the best players in addition to getting paid really well salary in addition to more commercial deals since they have one of the biggest fan base.
As you know, 95% of the time Madrid get what they want.
IF there is any new talent ( Robinho, Vini, Rodrygo, Endrick...etc ), or already existing star ( Ronaldo, Mbappe, Hazard...etc) usually their ultimate dream is to join Madrid.