"What's Your Best Price?"

If they don't have any questions about the product itself, I find it hard to take them seriously. When their only concern is price, I assume they are fishing for things they can pick up cheap and turn quickly. That's O.K. because I too am fishing when I advertise.
Personally, I would suggest you follow Marco's advice. You've made the first move and paid $6.00 to do so. Now it's time for them to demonstrate some interest or commitment besides a mass produced "What's your best price?" I can imagine some guy sending out 250 of those a day.

Simply put -- If a person is only interested in the price without any regard for the product being offered, I do not regard him as serious. There are two sides to any purchase negotiation. Seller has a product or service and buyer has money. Presumably someone will be concerned enough to find out what is being offered before he asks about price. There is always a relationship between the two and anyone who ignores one side to focus on the other is not properly motivated.....in my opinion.
I don't need the business of someone who doesn't even say hello.

Thank You, Onhwy61.
That's what I wanted to express. When a person goes right to price before first establishing that the product is actually what he is looking for, I just write them off as bottom feeders. If, perchance, I am shooting myself in the foot, so be it. I'll wait for a more cordial and, seemingly, more sincere buyer.
I'm also amazed that a person who will quickly drop the price by 10%, is adamant that his buyer pay the 3% Paypal. fee. I'd rather have full price and deduct the Paypal figure as a courtesy. In truth, I guess that's the word......courteous.
Going right to price seems rude to me. And I certainly agree with those who refuse to bid against themselves.
In real estate, it all goes on paper. Buyer submits a signed offer. Seller accepts by signing, rejects it outright or provides a signed (or initialed) counter offer. I always thought the agents primary function was to provide insulation between the egos.

I think "Best Offer" means best offer. That might mean the most money offered, or the offer that the seller finds most attractive. If someone offered me half my asking price and a two week stay in a Mediterranean Villa, I might well take that over a full price cash deal.
That may not be the most clever example but I hope it conveys the idea. There are more possible interpretations than the one that most immediately springs into your mind.
To take it a step further, imagine that you have advertised your Audiogizmo Thermal Dissipator MK II Rev.3A for $225 obo.
Member "Tipafew" contacts you with an offer of $650 if you cover shipping and PayPal. You can enail him back and have the money in your account in less than 30 minutes. What would you do next? I know I would take a few minutes to explain to him the true meaning of obo and insist that he offer less than my asking price. I've always felt responsible for his education.

Neptune is where those who like liquid sound gather.

My "best price" is the most I can get.

But circumstances change.There are a lot of Americans who would gladly sell their house today for 20% less than a number they would have laughed at 4 years ago.

Nothing but sharks left in the pool.

When you post an ad, you provide a price. If you also indicate "OBO" you are stating that you will accept less. We would all like to believe that we are immersed in a gentleman's pastime and therefore are above smarmy, crass concerns such as money - or, at the very least, put those financial matters in their proper place, well behind our sanctimonious pursuit of the absolute sound. So, the objections here seem to be mostly procedural.

What turns me off most is the impression that some jerk is just sending out 300 emails per day fishing for someone dumb or desperate enough to sell him product well below its current street value so that he can turn around and sell it at a profit. What nerve!!

I've stopped trying to sell my stuff. I have lots of spares and it looks like I will eventually die owning them. In a way, it has been good in that it makes me think twice about acquiring more.

Many of you are getting way to huffy about this topic. If schmucko has nothing better to do than send out mindless solicitations, have fun with him. There are many ways to do this. Let's turn this thread toward creative suggestions for wasting the time of these guys. Engage them, tempt them, mislead them and ultimately give them a taste of their own medicine. Drop tem on their pointy little heads.

What's your favorite technique?