New trucks optioned out cost $80k+ and plenty of people pay for that without having much justification of any kind for it.
In the US, certain purchase categories make taking on debt to cover upfront costs trivially easy. Open robotics platforms are not one of those categories, while automobiles are.
Meanwhile a guy who made a fortune in tech optimizing ad placements (not saying that's OP) can pick one up on a lark, and as you said it usually ends up in the garage next to other expensive toys like an $80k truck or autonomous Tesla. Also the $80k trucks are a great example because they're more of a status symbol, just like the robots will be.
These days, $30k is cheap enough for a university lab and so a lot of them have picked up these models.