Exactly. It’s not just downtime to worry about, either. It’s disks filling up. It’s hardware failure. It’s DNS outages. It’s random DDoS attacks. It’s automated scans of the internet targeting WordPress. It’s OS, php and database upgrades. It’s setting up graphing, monitoring, alerting and being on-call 24/7 to deal with the issues that come up.

If these businesses are at all serious, pay for professional hosting and spend your time running the business.