I'd consider a 1tb machine at 20k, but I'm not going to pick up a 256gb one at all. 1TB fits a frontier-ish model in memory without massive quantization, which is a very interesting capability for a non-rack piece of compute.
At that point just rent proper GPUs in the cloud, you'd have way more power and pay only what you use for.
I'm not optimizing for $$$ spent today and agree that this isn't the cheapest solution to a specific capability problem, but I don't super mind paying for a cool piece of compute that I can do some fun (and educational) stuff with.