You also have to ask the seller his/her motives (which is almost impossible to guess on the other bay). With myself, sometimes, I really have no clue on what a particular item is "worth" so I will start out with a high price and if no one is even looking at the auction, I will try to adjust the price to the point that is sells. I call if fishing.. finding what people are willing to buy it now with hesitation, getting the maximum I can for it. (This is not just Amiga stuff, but anything I do put up on the other bay). I use the other bay for clearing out stuff I have no room to let sit on my online store.
On the other hand, I have stuff (like my PET, and 3000T) that only if the price was right, I would part with. I know on my on-line store that no sane person would pay the price I am asking for my PET and 3T (in fact there have been many threads just on my 3T here and on other Amiga Forums). I also include insured shipping in my prices and both the PET and the 3T would cost huge amounts to actually ship anywhere, never mind overseas. (EVEN MORE FOR THE BOMAC tower), so people should actually try to find out why the price is so high, before jumping into attack mode.
Although, it is true that some sellers on E-bay, ARE just plain insane.