It makes sense if it is a future purchase, as in, we look at other established well polished defedenders who have 2 or 3 years left in them, and we have criscito and senderos as back up.
however that kind of money is nuts!!
Also, i dont see Barzagli being such a key signings, he is not that great, and he probably gets more attention than he should because he is the only italian defender who is decent besides cannavaro and nesta, and possibly matrix.
And we have to remember that Grygera can play as a centre back, and Chiellini is constantly being used as one, whether that is his future position or it is his position now based on the fact that we have no other decent centre backs.
IMO the club needs 2 established centre backs, but also needs to allow for future defenders to come in as well.