I do. Or used to. Then I kinda learned how it all works. If I had an item that could sell for say, 100 on ebay, I'd list it for 80 to get a quick sale without shipping. Then people offering 50 seem rude or crazy to me.
Then I learned to just price it high. So now, that item I'll list for 120, and 'fine, final offer' it to 80 and that works way, way better.
I think people just want to feel like they won, more than about values of items.
Another protip: Never list anything for free. You'll find the worst in society. List it for 5 or 10 dollars, then just tell the buyer it's free when they come.