It may well be an issue of culture, or education. There are times a potential buyer, giddy with the thought of falling it the deal of a lifetime, is tiresome and unappealing when parting with something you have found value in. Perhaps like shaking the hand of a teenager who has just come out of the bathroom with a skin mag and would like to meet your daughter. She may be technically "fair game" but that does not mean it is pleasant to deal with the pimples or greasy hand. We are in this for the pleasure of music not low life ego trips.
Why do so many sellers take offense to offers on their listings?
If you have the 'offer' feature activated then what's the problem with any offer. Comments like 'lowball' offers will be ignored just gives me a bad vibe. If your item has been up for sale then there is no insulting offer. I've made deals with people starting far apart and coming together. If you haven't noticed the audio market seems to have come to a standstill. Any opinions?