Spot pricing and instance availability don’t apply to on metal hosting. You’d have your own machine dedicated to your own use only, at a locked in price.
That's too small. I was quoted a machine with ~1.5TB of vram, for $10k/mo. This was the minimum node size in the AI data center I was talking with -- they don't make smaller nodes that you can lease as bare metal. There is no public pricing though, and you had to know people to get in.
It’s also annoying because then I need to make sure my little “lab” setup is well automated, and I’m lazy :)
Also, I literally said “ It's not financially a good idea” so I’m confused why you think I don’t know that.