And most important reason is that I think Marotta is far too good guy to ditch Quagliarella like that.
We're buying Vucinic and that's a purchase that potentially puts Quag on the bench. Actually, the bare fact that we're chasing attacker(s) like crazy (Aguero, Rossi, Vucinic...."Vucinic doesn't exclude Aguero") says that one of Quag and Matri could very well be sold.
Anyway, it all comes down to Quag's injury. If the chances for a repeat are big, then no matter how good guy Marotta is, selling Quag while he can still give a good return of the invested money is a MUST.
It also might be in Quag's interest to go to a team where he'll be more or less guaranteed the starting spot. With the EURO coming and all that.