Ya, this isn't really much different than what happened with Messi. They discover a kids that is above average for his age group, they will do this. The kid will get the best possible football training, so it's very likely that he'll at least become a professional level player whether it's for Barca or not.
They will also probably put his family in a house and provide them with more as well. In a few years, they may even start paying the family for the kids training and playing for the youth team.