I feel bad for some of these sellers -- in particular, those who really don't know anything about what they're selling. They get some friend or family member who tells them that stuff from the 80s is worth thousands of dollars/pounds/euros and they believe them.
Where I lose my patience is when they cannot be bothered to do the real research themselves. I recently sold a Cisco PIX 501 with unlimited users for which we paid $850 about six years ago. They're all still good and usable units but quick research showed they couldn't sell for much over $150. Mine wound up selling for $50.
