I recently got annoyed with the amount I was paying on actions for a single repo. And decided to use a Mac mini that I had lying around to become the sole self-hosted runner for that repository instead.

It was ridiculously easy to set up, reduced my issues with GitHub significantly and the mini will literally pay for itself 3-4x over this year with the $$$ I'm saving not paying for GH actions.

The most surprising part for me was not the cost savings, but that all my workflow runtimes went down by about 70-80%.