What's so wrong with that? Most big clubs do the same.
Barcelona did the same when bought their Dutch players, the Brazilians (Sonny Anderson, Rivaldo, Ronaldinho) or even Cristophe Dugarry.
Since Maldini, who is Milan's young player who can cut it into the first team?
Even Andrea Pirlo can get himself into Internazionale' starting line up.
Also Juventus with Crisctio or Giovinco.
The same with United. After class of '92, we no longer see any promising youth player promoted from their academy.
The good side of this is clubs like Stuttgart (Khedira), Benfica (Di Maria), Werder Bremen (Özil) or even Man Utd (C. Ronaldo) can use the huge transfer money to teach their own youth talents or buy less expensive players to strengthen their team (like United with Valencia).
Udinese and Palermo, for example, both scout and buy young players from every part of the world.
They teach them to be potential players, now they have Alexis Sanchez and Javier Pastore with high price tag.