I have a silent low-power ex-thin-client box sitting in my living room that is used to perform batch jobs. It's been running for about 2.5 years, cost about $26

I have a silent low-power ex-thin-client box sitting in my living room that is used to perform batch jobs. It's been running for about 2.5 years, cost about $26 to buy the hardware second hand, and maybe costs around $20 / yr in electricity. Internet is $0 as I'd pay for that anyway and it doesn't need much bandwidth. It executes about 85,000 batch jobs every fortnight, so call that about 5.5 million jobs total. So that's about 72k jobs to the dollar. Handwaving 1 request as being comparable work to 1 batch job, the lambda setup described here is doing about 117k requests to the dollar. I'm massively over-spending! The box is currently using about 10% cpu (postgres processes) and has 2 gb of memory available. I guess I over-provisioned and should go looking for some customers to onboard onto my "cloud" to get better utilisation and help amortise my operating costs.