OK.
Perhaps I, and others, identified this as a troll post too quickly instead of a sincere post. Let me try and answer in a sincere way.
There are many reasons why a person would sell off pieces of their Vape gear. Here is a list of posible reasons....
They quit vaping all together, and have no use for their gear any longer
They have moved on to other types of vaping gear and do not need their older gear any longer
They are in need of money to pay the rent or bills
They want some new gear and are selling their old gear to fund the purchase
They are dumping stolen goods
They over bought in a co-op and are pairing down their collection
They just don't like the thinghy they bought
There are countless other reasons for someone selling their Mods, Tanks, Juices, Clearos, Glassos, RBAs, and RDAs