Some good food for thought, and I'm with Jennifer, this thread is interesting. Trace and Mark brought up the issue of choice. I should have used a different word than "ignorant", maybe "un-willfully naive" would be better. I've been a serious lurker on this site so I know Justin is not an ignorant buyer because I've come across his posts in the past. But because as Jon pointed out, there are no ratings on GS, there's no way to know whether or not the description is accurate or the seller is legitimate, and I assume (maybe I'm wrong) that handling an issue between buyer and seller is outside the realm of moderators here at BPL… maybe other people have insight into this through past experiences. Unless you can see and touch the item I would say there is always going to be discrepancies (honest and dishonest ones). So I would have to disagree with the notion that buyers on GS have a clear choice. The way it's set up now, and as Justin seems to have experienced, there is room for false choice because certain greedy and untransparent individuals will take advantage of the capitalist mindset that if there is no regulation against it, then it is therefore acceptable (regardless of whether it is ethical). These people suck but we want gear so we put up with it I guess.
Again, I don't think these GS traders are really that big of an issue, people on this forum tend to have a bit of disposable income so losing a few dollars here or there probably doesn't matter much in the long run. For those without much money, getting screwed can cause significant distress… but then again I like new gear (I wouldn't be here otherwise) and here I do agree with the "choice" statement; I can always just not buy new gear (probably the far better decision in most cases). What I don't agree with is when someone dishonestly claims to be giving you a "clear" choice when in reality its a different choice.
If you make an honest effort to price something and you do a poor job of it and somebody sends you info that suggests you ought to augment your price… is there any foul there? I would actually appreciate someone bringing that to my attention. And where people are getting the idea that we should be selling things to each other at a significant discount, I don't understand that, and I don't think the OP was suggesting that either. If you want to give something away then all the more power to you, but this is not going to drive market prices down, BPL's gear swap doesn't exist within a vacuum (there's the force of the retail market, Ebay, craigslist, etc.). If someone sends you a link of a particular piece of gear that sold for less than what a seller is selling it at at the moment, then you should be able to provide links to retail sites, ebay auctions, craigslist postings, etc. that justify your price.
Greg M. good for you, it's awesome to hear that you have refused to sell to some of those buyers in the past. This is what GS COULD be. A community recycling gear to other excited users for a fair price and from someone you hopefully know and respect.
A question for Mark H.:
If you wouldn't do it yourself then why would you try and defend the idea hypothetically? Sorry to put you on the spot but what you wrote just strikes me as self-contradictory.
To address Kendra's point, I don't think GS is where you go for great deals (try Ebay and other giant retailers for that). GS is where you go for an excellent selection of gear that actually works and is not bogged down by trends and gimmicks. I have heard Roger C. make this point and I agree. You go to GS because by in large the people on BPL are good people (although the stats that Greg M. posted suggest it's quickly changing) and assuming you by from someone who posts on the site away from GS, you are probably getting a very reasonable quote. I have plans to sell a backpack on GS shortly and I will be taking Greg's position. Hopefully I am able to put it up for a fair price and if it isn't I trust you all to post/PM otherwise ;)