I had an RTX 3060 sitting on a shelf.

Not broken. Not old. Just... not doing anything. My Windows PC runs models when I need them, but most of the time it's idle. The fans spin, the power draw ticks along, and that 12GB of VRAM just sits there.

A week ago I connected it to Vast.ai — a GPU marketplace where people rent compute time. No code required. You install a daemon, set a price, and wait for someone to rent your machine.

Here's what actually happened.

Why I Didn't Just Mine Crypto