The difference between buying at the right time, when the price of the player is the lowest possible and buying in a wrong time or make a panic buy when the price of the player is too much over the realistic price.
Just compare when, how and for how much Secco and Marotta bought Melo and Matri and when/how/how much for Vidal, Vucinic or last year Milan with Zlatan, Cassano, Robinho...Inter with Sneijder etc.
Here's :xfinger: for Marotta establishing relations with Real Madrid because that team is always giving opportunities to sign quality under its realistic value.