Audio valuations


Is anyone else interested in determining a fair value for used high end equipment? I understand we all try to sell and buy our equipment at the best price, but where to start? I recently listed
a item for sale and set a price that I thought was competitive based on very limited past sale information. I did receive an offer that was $500 less than asking price. Was I too high or was the offer too low. It would be helpful if we could see what others sold their equipment for and the condition of the equipment. I want to sell my equipment, but I don't want to give it away.
Any thoughts on this matter?
elf1
@elf1 
I've run into similar experience... A few things. I suspect the economy has affected even many of the mighty audiophiles. Getting someone to pay thousands rather than hundreds is tough.  
I have a pre for sale now.  For what it is, It is offered at a fabulous price and I am already losing a few hundred dollars from what I paid for it just months ago. In this case, my assumption is that it isn't one of the Big Brand names, so being less known is not getting the looks of the big brands,  but it is a fabulous product and I have no takers. 
Lastly,  there are a select number of people interested in a narrow product category. I suspect that our audiophile community is aging and shrinking.  Good Luck Brother,  Tim 
I do that daily and as a result of such endeavors, I'm not offended, frustrated or worried about low offers. All I do is agree or disagree. 
If you reveal component you want to sell, I'll throw few cents...
I guess I should have been clearer with my question. I am looking to sell a tube preamp that can be considered vintage. Needless to say it is difficult to find many of these AR SP6 preamps for sale. If Audiogon, US audio mart, ebay, etc. would provide the actual sale price would be helpful. I understand that vintage equipment to a collector could sell for a different price than someone who wants to use the equipment. I am sure all members would appreciate what other items sell for. 
To answer Yogiboy, I have the preamp listed on US Audio.

The market for many items here is very thin. In a thin market you have two choices, just wait for the right buyer to come around or reduce prices until sold.

In a very thin market, past sales are less a predictor of what you will currently get than they are in a dense market, IMHO.