Ask HN: Are hourly priced dedicated servers for AI/ML a good idea?

On Hetzner or other providers, one can find lots of high performance dedicated servers, some even with graphic cards as powerful as a GTX 1080.

The problem is, you have to rent them for 100 EUR minimum per month plus set up - which doesn't make sense if you're a ML/AI engineer who just needs to train a model or two for a few hours.

Thus the plan is to buy some of those servers upfront and rent them out on a cheap hourly basis to ML/AI researchers, or even some cloud gaming companies. I've done some research on the technical side of things and I think this should be entirely possible to do.

I calculated that with about 50% usage one could sell an instance with a Nvidia GTX 1080 with an i7-6700, 64GB RAM and 500GB SSD for about 0.5 USD/h - which is significantly cheaper than AWS/GCE and probably ideally suited for AI/ML tasks.

But is this really a good idea? I'm always very excited about new side projects to do, but often overlook critical flaws in my ideas. For instance, why are companies like Hetzner not already doing this?

Thanks!