Actually there is a good market for used accounts. Most buyers want to use them for signature campaigns where they can get up to 0.2 BTC weeks for Sr. Member / Hero Member level. Thus, it makes sense to pay up to BTC1 for an old account. But there are also scamers which are new and want to give the impression of being very experienced. There were some altcoins announcements in the past from accounts which were sold closely before.