I've been mountain biking for 20+ years. With no engine a good bike costs 8-10k (CAD) and a top of the line 13+k (some even higher for race machines). No engine. For a yz450f or similar it's 12k (+/-). There was a good video where two guys talk about why a mtn bike and a dirt bike cost the same. Mostly production costs and options. Dirt bike has 1 option, mtn bike - pick size, colour, components.
Anyway the point of "9k for something with no engine" just reminded me of the bike comparison. In snowbikes case it's number of units I suspect. As everyone points out it's niche. But like the snowbike kits people keep upgrading to, mtn bikers have been doing the same for years often for only small improvements (fairly common people get a new mtn bike every other year). Sure things are better now than when I started but it's a slow change.
The good thing is that as people keep upgrading it keeps the innovations going.