Why do so many sellers take offense to offers on their listings?

I've been shocked a bunch of times, at the low price an item I was watching, sold for (relative to asking price). Would have bought it if I knew how low price would go. I'm never offended by low offers, except the few that then argue why I should accept their low offer. Most of us here are not professional sellers.

Value is in the Eye of the owner. And sometimes we get emotionally attached as human beings. 

I’ve seen on USAM that there are people who seem to just low-ball everything. Occasionally they get a taker, and then the re-sell it here. Supplemental income, I suppose. Depressing. I guess you could call it arbitrage or market clearing.

As an old dude on a fixed income I look for value in quality used audio gear. I do my due dilegence and know within reason what the product offered is worth. I also will only purchase used gear close to home that is in excellent working condition. By purchasing used local  should any isue occur it can be resolved face to face and I don't have to pay shipping. My initial offer may be 10% or 20% lower then the asking price if the initial posting is in the fairly priced range.Since I look for used as a buyer I must be flexable based on who the manufactorer is and my desire to own that product. I was fortunate in purchasing newer gear with excellent reviews at a very good price.  The components may not be an ideal match but hey I'm buying used so compromises are expected. I might also add that the audiogon sellers were beyond reproach.

My trip to the Honda dealer for service reveals a $40 k Civic with $10% ADM tacked on as the starting point…… I think Mike makes good points, good faith is essential…on both sides….

The ADM on a G wagon at the local Benz dealer was 40%. Glad i got ours when buyers had more sway……