I don’t get the need. With gaming there’s a real benefit to having the card close to a display. There’s enough benefit that you don’t mind it being unused 20 hours a day. There’s relatively little benefit to having training happen a few feet away rather than a data center. Solid chance it sits unused most of the time, and when you really need it you run into capacity issues, so you’d need to predict your future needs carefully or be happy waiting for a job to finish.

AI training feels like transport. You rent the capacity/vehicle you need on demand, benefit from yearly upgrades. Very few people are doing so much training that they need a local powerhouse, upgraded every year or so.

Even sharing the hardware in a pool seems more rational. Pay 200/month for access to a semi private cluster rather than having it sit on your desk.