That really doesnt indicate nothing. I wouldnt necessarily say its a "trap" but there is a certain allure to listings like that. The buyer stumbles upon this listing and gets sold on owning this just because of the same things you attributed to it yourself; the anonymity, the poor description, the "lack of knowledge" seller may or may not posses of what he has. It equates to a "found in the wild" item. Once a buyer is in that state of mind, it is very hard to let go and very easy to lose sense of actual value