What's good back of envelope break-even for when I should move to K8S from a set of hand-rolled scripts and manual processes to manage a bunch of VMs? It defin

What's good back of envelope break-even for when I should move to K8S from a set of hand-rolled scripts and manual processes to manage a bunch of VMs? It definitely feels like more than 10, but how much more than 10? And do people manage database servers using K8S? Or is it better than hand manage those?