P4's used to sell but I think refurb guys have hard times selling anything without 2 real cores and PCIE/DDR2. This guy must be getting 3 year old office machines after company upgrades and if so they are probably worth $12 just for parts to resellers if the brands and models don't vary too much. I don't think there is much money to be made anymore refurbing towers (too many people fighting over parts driving prices up), they seem to concentrate on laptops anymore of just quit.