Originally posted by DeadJohn Many potential buyers ask questions and ultimately decided not to buy. The seller shouldn't be obligated to wait for their decision. Whoever promises to buy first should get first dibs in my opinion, then give that buyer a reasonable amount of time to complete payment.
When they are asking questions but undecided, I draw the line at where their intention is. Some people ask questions like, "Yes, this looks interesting, and I think maybe I can use it for so-and-so [type of image/project/whatever] -- do you think it can do that?" That's vague, but their intention seems to be "if I can be reassured that it is suitable for what I want, then I'll buy it". And then I'll tell them yes it is, or no you'd be better off with this instead (and yes I have done that -- told them to go buy something more suitable). So as long as it doesn't take them forever in-between responses, if their intention quickly becomes clear (i.e. are they serious and really need information, or are they just doing general research and/or are curious) and they are a serious buyer, then I'll hold their place in line and answer all the questions they want as long as it is happening in a timely manner. Or sometimes they'll want a particular kind of sample image, and so I'll go do that (now it is up to me to respond in a timely manner) and even if someone else PMs me that instant and says "I'll take it" I'll tell that new person someone is ahead of them and I'll let them know.
I just try to be fair, and honestly I've never had a problem. Some people have expressed mild interest, or serious interest but honest about not having the money just now, and I've sold it to someone else (without them getting mad about it); and others I've had multi-day conversations with and did end selling to them even though I had other willing buyers waiting to see what would happen.
We covered a lot of these issues recently in this similar thread:
https://www.pentaxforums.com/forums/3-site-suggestions-help/297809-suggestion...etiquette.html