This sort of thing has always seemed kind of crazy to me, and as a parent now, I really think it seems even more crazy. I just don't see any way that I would uproot the whole family, find new jobs/schools/whatever in the hope that my kid actually gets somewhere with the club long term. I can't tell if that makes me an awful parent or not, but seriously, I just can't see it actually happening.
It is kind of crazy, but it's the only way you can legally have a player from the US train at any of these clubs at a young age. If the parents think he's good enough to have it be his livelihood, then it's probably worth giving it a shot. His earnings potential would far outpace theirs most likely.