Remember also that it's late Summer and lots of people are on holiday and generally tend to spend less money on non-big-ticket items this time of year. I suppose it could be different in Europe, but with the amount of holidays everyone gets over there, I doubt it!
Basically, what I'm saying is that I think eBay is a buyers market right now thorugh early Autumn. Sellers will generally not get as much for their items, especially common items, as they would listing them in the Winter and Spring.
Drunken DM and the Speak with Dead spell: "No, I'm not the limed-over skeleton of the abbot, and no this special key in my boney fingers does not open the door to the secret treasury! ... Oh crap."