Kendrah wrote:Ethereal is still a very rare pet
This is a misconception. There are 291 ESTs on Horde AHs at this moment across all US servers. Compare that to 116 Crawling Claws, 122 Crimson Whelplings, 65 Dragon Kites, 39 Rocket Chickens, 11 Tuskarr Kites. It's priced like a rare pet because historically it has been rare, and there has been no significant new supply from the only legit source (ie the trading card game). Nonetheless, the supply has increased massively and without any official notice (because it's almost certainly due to duping). Therefore we still perceive EST as rare even though it's not.
So the ESTs you see on your AH are almost certainly dupes. But we have to be careful about accusing people of duping. If it's on the AH, there's very little chance that they're being sold by an actual duper. Dupers avoid account bans by conducting business using barkers in trade chat, who will direct you to a separate toon that sells you the actual pet. The overwhelming likelihood is that this seller is a legit player who invested in cheap ESTs and is now trying to flip them for a profit, or--more likely--cut their losses.