Wow wtf? Is it just because it can be used in business/retail?
Over here, Zellers stores (under liquidation) are selling all their equipment and when they started, registers and computers were like $350 or more, even though they're from years ago, and they even had a computer to use for retail purpose that costed $1000, and it looked like it was from a few years ago too!
They had no calcs like the above that I saw, but I bet they're charging pretty high for them if they do (even though they're used). I bet they want to extort as much money as possible from people who are willing to build a new store. >.< (kinda like how almost every promotion service for musicians are not free and they're expensive). They're even trying to sell them on Kijiji (a site similar to craigslists).