[metalalchemist]

Well friends, the insult is great, but the answer is really simple: They do it because there will always be people that will buy them; the same reason why a dude will sell for $30-$50 a $7 figure at ebay.
Call it a granny, uncle or parent looking for a crappy kids toy or a person that simply likes them, they will end up selling.
Unfortunately, they are more than us and kind of less informed, so as long as they keep buying there is not much we can do. Prices will go higher, discounts smaller and smaller...yady-yady-yada, you know the rest.