$3k is already close to the price of just a 5090, so if you can have a reasonably fast but way more (equivalent to) VRAM (128gb) machine sounds great for a hobbyist assuming you can easily run and train llama, Stable Diffusion and similar vram-hungry projects.
Nvidia completely skipped a middle tier. DGX Spark is very underpowered for $3,000. DGX Station is likely $150k - $200k. There is no middle tier at all.
A middle tier could be something like an RTX 5090-like chip connected to 128GB - 256GB of GDDR7 RAM for $15k - $30k.
