In reply to aujayeb:
Not including airfare? Seems quite expensive.
I spent five or six weeks in Peru last year, but in the Vilcanota, not the Blanca, and probably spent less than $3,000 in-country.
This included a week in Cusco in a good hotel, good cafe meals, a trip to Machu Pichu, the Ausangate Circuit trek, climb of Ausangate (6350m) with two horses and two horse guys, but no guide, our own food, a few more days in Cusco, van to Marcapata and two horses and horse guys for a week long trek around 5000m (Paso Chimboya, Quel'caya) and attempts on a peak, then a van back to Cusco and hotel.
In three weeks there is a chance you would not get up those three peaks, and $7,500 would seem even worse value.