Something that isn't appreciated enough is how reliability issues demolish your teams throughput. Got a random cluster restart heisenbug taking customers offline? good luck debugging it for the next 6 weeks. Alternately, ignore the problem while your engineers get woken up at night until they quit...

The progress of software has been towards managed offerings for a reason. A company can make it their entire business to own fixing these reliability issues for you, and keeping them at bay. Do you really want to be int the business of managing a cloud on your cloud?