haha! Yeah, I don't know exactly, but this thing was the first of its kind and you know how people get about a certain brand or product and then the internet turns it into a big thing.
They stopped making them something like 10 years ago and when they change hands these days, it is for ~500.
So I guess it is due to the Kip Carrier fanboys and the extreme rarity. I will say it is a super duper nice part. You can't even tell where it goes from Ti to Steel. I bet they were pretty hard/costly to make. Everyone obviously loves his Ti tubes as well. I think I waited 6 months for mine, but back in the day sometimes the wait list was over a year.
Lighter than the OEM part and WAY better feel!
I don't know why I own a $2k shotgun either, but I love it too!