I'm gonna say, first, that I needed an extra sear as a backup for when I dove into modifying the Notos trigger and AGAF in CA got one for me, but I'm thinking it was the only one available. Other parts look like a no go. Sooooo, having said that, I'm ok with buying a <$300 gun with no parts available, BUT, get above that magic number, and you are not talking to me. If a manufacturer can't provide parts for an expensive airgun, then I don't need it, there are simply too many out there that do. This is a competitive market, so play or get out, as far as I'm concerned.
I love the Notos and if I really wanted parts, I'm not averse to buying a whole gun to have the parts I need, but beyond that, no thanks. I have FX, Airmaks, Weihrauch, Brocock, BSA, and Crosman, which I can readily get parts for. It still irks me the manufacturers who won't publish oring data. That's obscene, we all know every pcp will need an oring sooner or later.