I agree with most of the advise above...
People just throw numbers out there, so you have to talk to them and negotiate with them a bit... "You know I've seen this pin before and it was $2500 but that was in perfect condition, if it wasn't across the country I might have gone $2500, but in this condition I can do $1500" or whatever the case may be...
Sometimes you'll find a guy who is unrealistic and unwilling to budge or you may find he was starting high just to settle lower... It's a great approach to selling unique products, but as a guy on the other side of things you have to either a) low ball so that you can negotiate to a fair price or b) settle on a number and be honest and clear that that's your final offer and just walk away... The problem I see most often comes when the seller starts high and the buyer comes along with a number in mind, say you were willing to pay $2500 as your final price and that's what you offered first, but then the seller offers it for $3000 and you're like "wow he came down a lot" and give up on your initial price of $2500 and end up paying 20% more... Either lowball in return and be willing to negotiate or offer your best and stay firm, willing to walk away... If you go the latter route, don't be surprised if you get a phone call a few days later asking if your offer still stands
