Fortunately, whenever I sold items on Audiogon, I have never been "desperate". So, I investigated the "market price" for the item, remembered how long I have owned it or how old it was to determine how much to mark it down or mark it up in the event that it was worth more and started from there. I always have a price point whereby I will not go lower so, when some send extremely low offers, I always respond and tell that person that it is wayyyyy to low. If their offer is close to my price, I may compromise, spit the difference if it isn't too much, etc. But, all buyers and sellers can check the blue book values of items. It also shows trends, average prices, low and high prices also. I always try to price my items to sell, so I typically price lower than average blue book prices anyway. Some may think that I'm desperate when they see my listings because it is lower than average blue book prices (unless it is a rare jem and I won't lower it), but when they submit their offers, and it is too low, I simply tell them thus and that is it. I will not respond to a stupidly low offer with a counter offer. It (to me) is up to the buyer to present a reasonable offer. I will not haggle when selling. As long as I'm within the respectable used sale price range for the item, I can dance a little. I'm not trying to make money here, but I do want to get what the item is worth. Yes, it is worth what a person is willing to pay for it, I've said that here many times. But we have agreed to establish a rating/pricing system (blue book, etc.) and I use that. Most stereo stores definitely use it for demo and used equipment for sale.
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