I see your point. The counter-point is that I've never NOT sold anything I was trying to sell. Why tolerate the frustration unnecessarily?
I discovered about 20 years ago that fishing is a LOT more fun if I leave the bait at home, and use that un-used space to take more beer. BAIT=Optional. BEER=Essential. Fishing is indeed an art form.
This is exactly my experience. I'm too old now to be wasting my time on an insulting first offer or ridiculous 1st email. There is always another buyer out there, always. I do negotiate, but only with people that aren't trying to get it for way under fair market.