For me anything over 1k is an expensive bass, a big consideration though is how replaceable it is and how much attention it would attract.
My main bass is a Schecter P4 Exotic which I’ve modded with Turner Pickups, the bass + hardware is over 1k which makes it a luxury item (not considering the time to route new pickup cavities and making a custom scratch plate) for me but I know if anything happened I could replace it or at least get something similar. It’s also fairly inconspicuous, just a P with some funny pickups and Schecter isn’t a super desired brand to my knowledge. I don’t really mind taking it to gigs even though it’ll make me nervous leaving it around backstage etc from time to time.
My Alpher bass (in production) will cost significantly more and will be a one of a kind with a long lead time. It’s going to be a lot more flashy too with a very figured burl top etc and looks expensive. It won’t be accompanying me on any gigs!