Because it's shortsighted. When people realize they get ripped off, they tend not to make the same mistake twice. If this was a fly by night model, it would work. But if they are here for the long term, this is a mistake.
I entirely disagree. What is there to gain by selling a limited quantity item well below what the market will bear, eliminating one's supply quickly, and then having nothing to sell while waiting for more items to be manufactured?
I swear, some of you act like you think the hardware makers are charity organizations instead of businesses.
A business that delivers what they promise, when they promise, at the agreed on price (or market-negotiated price in the case of an auction model) is a good thing. I agree that many of the hardware vendors don't fit this, but it's absurd to argue that someone is "ripping buyers off" when they deliver an item exactly as advertised for a price that is higher than you think is sane for it.
"Ripping someone off" would be selling a 20GH miner that only performs at 10GH. Not selling it at an auction for as much as the market will pay.