If you're able to do that, then you have a huge skill! I'm not much of a devops engineer myself, so I'm leveraging work done by others. My skills are in application design. For hosting I try to rely on what others have built and host there.

If I had your skills then our costs would be much smaller. As it stands now we pay about $700/month for everything - the bulk of it for a 16gb ram / 512gb space database.