That's a very random lens...(1) you'll continue to find it priced high from sellers who know people like you exist and are looking for one, or (2) the lenses will eventually drop down to a few hundred dollars because we'll be in a time where mostly everyone doesn't know what a FZ mount is.
Cine lenses are always overpriced...right now if you can get it for around $1K, maybe that's pretty good.