Yet we instantly buy into a startup ski company that does something cool like Renoun or ON3P etc etc
The bike I bought this year cost many times what any of my skis have cost, and I plan to keep my bike for many years, vs 1-3 years for a pair of skis. Trying out an indy ski, especially as many of them are at a nice price point (not Renoun IIRC), is a relatively small risk. Much different from a bike. And bike demos are much fewer and farther between than ski demos, especially in the right size.
So there are lots of reasons you might be willing to buy a ski from a relatively unknown company, but be hesitant about a new brand of bikes.
I'm on the "wait and see" bandwagon. If Rossi has been proven as a high end mountain bike the next time I'm looking (which should be many years hence), and if I can get a demo, then sure, why not try it?