I have never been a fan of anything above 3 nines of uptime even in a business situation.
Your business will not collapse because of 10 min of downtime a week, and if it does that is not technologies fault.
I don't even bother to track my home setup.
I agree, but the number of business that have actual need for extreme uptime is insignificant compared to the number of businesses that don't but think for some stupid reason they do.