Have you tried clicking it outside of the vendor menu?
We made it not sellable to the vendor so that wouldn't happen by accident after buying it.
Hi and thank you for your feedback!
We understand the lack of progression makes it feel pretty shallow right now. That's definitely something that would be adressed in a potential future update.
The AH is actually a little more fleshed out than just a buyout timer. Putting up items with too high of a price will make them not sell. But the way it feels is very important so that's good feedback as well.