For us to fork out what is 2 or 3 times what we pay our top / senior professionals on any youngster, no matter how good he is, I suspect would cause a riot at the club - probably most other clubs as well.
You could try to work out some sort of agreement with the rest of the squad that when he’s sold they get a percentage of the fee but I’d think even that would be too difficult to work out and a non starter.