Having completed many flawless transactions with various head-fi members, I can confidently say that there's more to a sale than just money. You're dealing with human beings, not just cash flow. Establishing good relations with people seems to be an antiquated idea at times, unfortunately. This is probably enhanced by the anonymity of the internet as well.
Keep in mind I'm not talking about people who try to low-ball or haggle endlessly. It works BOTH WAYS. As a buyer, you need to respect the asking price, and if you feel it appropriate to ask for a lower price (ie, if the seller says she or he is open to offers) then for goodness' sake be reasonable.
Likewise, if a seller PMs me asking for me to make an offer, I just ask what she or he wants. I don't like playing games with haggling, and I feel it wastes both the buyer's and seller's time. Chances are, the seller who PMed me is going to refuse the offer and raise it anyway, so to save time let's just be up front.
I think the fairest way of doing business is to give the item being sold to the first person with good feedback who PMs meeting the buyer's asking price. I've had incidents where I've been in that position, the first person with good feedback who meets the asking price, only for the seller to turn around and give it to someone who offers them slightly more than their asking price. That, to me, is just plain greedy and repulsive.
On one occasion, a seller responded that he was getting a lot of interest, despite the fact that I was the first person to PM him, and so he was going to sell to me only if I gave him $50 more than his asking price. Needless to say, I told him thanks but no thanks.
So yes, to get back on topic, I find rudimentary manners and etiquette ARE important in doing business. Chances are, you aren't the only show in town. Why would people want to do business with you if you're a jerk? I know I wouldn't.
Edited by MuppetFace - 11/27/10 at 8:00am