In most cases yes. Then you have cases like Di Maria who signed when he didn't want to.If he signs then he wanted to sign, no?
If we get the player this young, we will have a Ronaldo situation most probably.
For me, it's still fine. The era of expecting players to want to play for the club because of their love for the club etc etc is almost over.
He comes, plays well, helps us win, moves to Madrid during his prime, works for me.
He comes, stinks the place out, we sell him for less what than what we brought, it's fine. Because we tried and did it the right way than going for aging super stars just for the name and clout.
If he doesn't sign for United, move on. We tried.
I am glad United are going in for players who have potential. Let's see what happens.