There's a good chapter in a book called Why England Lose which talks about how little clubs do to help. I remember a story about anelka, an insular character, going to Madrid and being left to himself. He took a senior players locker on his first day as he wasn't told what to do which instantly put the senior players against him. The last thing a guy like that needs. And this was a teenager in a new country that they'd spent a fortune on.
For some reason, clubs tend not to care for their big assets off the pitch.