I checked with a friend and he said they have a military formula of 7407 per 100lbs. So you are talking about taking reciept of 74,000 once fired cases. Some percentage of that is going to be waste, or not usable. I would guess some where in the 5% would be fair.
Even with that said, it would take something to ship and then handle, sort and count then package it to ship..
Someone could make some money, but you need to have somewhere to handle 70K peices of Brass.
I would imagine using a front loading Washing machine and a mountain of Stainless steel polishing bearings.