I guess I wasn't clear-- I wasn't so much making the point people do own $4000 in GPUs (though I suspect you are massively underestimating the number who do, also before the current market conditions this would have been more like $2500 in gpus...), but they certainly could per the evidence of car ownership.
A car is super useful, so is an AI. But even if we decide cars are incomparably more useful a great many people pay much more than $4000 over the minimum viable car, and that's money that could be deployed to secure access to private, secure, and autonomous AI facilities. A few thousand dollars in computing is consumer hardware, or at least could easily be with more reason and awareness driving adoption.
People spend a LOT of money in things less useful than local copy of qwen3.6-27b can be.