If I were to list something for $50 when it is really worth half that and still someone bites, the only person at fault is the buyer as it is their choice to do so. No one forced them and that was their choice to make. No to both remarks. If a seller places a 'well below value' price on their item then they were lax in researching current market value thoroughly or perhaps the person just needed to get rid of it quickly (for a move or something), and items change their exclusivity all the time (think polybags) so you can't blame someone for trying to capitalize on that 'exclusiveness' while the item still yields it (Comic-Con 2011 Superman & Comic-Con 2013 Azog for example). If we are going into the 'Walmart Wednesday' fiasco, well, the company needed to close down the site for the day on maintenance but despite all the incorrect listings they still kept the site up. Some people scored big simply because they wanted to and you can't exactly fault them for that unless one of them was the unknown hacker who deliberately attacked Walmart's site just so they could get some cheap Lego or more than likely steal people credit card numbers from all the charges that day. As for in store, if I were to find a set with an official clearance tag on it yet still rings up retail (or even a slightly higher price), I will have them match the sticker price. I'll even go to customer service if need be because it is their actual sticker slapped across the box. I did not put it there so it had to be a store employee unless some random guy is running around printing these things yet doesn't buy them him/herself. There is a point where I may question what the price sticker is doing there but, hey, if I find say a Pirate Ship Ambush for $40 in the clearance aisle I'm snagging it so fast your head would spin right off. There is a line such as running out of the store with unpaid goods, swapping price stickers, creating false UPC codes, site hacking, etcetera, but "buying too low" or "selling too high" makes little sense. Far as buying goes, if someone at Target slaps a sale sticker or messes up the price on an item, it is their mistake and I should not feel guilty for buying it. And with selling, any jackwagon can list whatever they want for the price they wish but it only works when someone comes along and is willing to pay. Otherwise it is much like every other unsold listing.