what am I missing ?

I have brought this up before, but just cant wrap my mind arround the answer. on the auction sites, surplus computers are now averaging well over $20 ea. something just dosent seem right here. I can barely eak out $12 per comp gross rev. Now I know I have been told many of those computers are refurbished and sent to other countries, but there again that just dosent make sence to me, when you can buy new computers for $250 +. you buy 200 computers for $5000 + 10% ship them to wherever you are referb them pay for that then ship them to wherever and pay for that. what am I missing here ?most of them are missing hard drives at the very least.