If you're a consultant or work on multiple projects, the equation changes significantly. What if you're building a web app for university, for example, with a fixed budget, and once it's feature complete, it goes into "maintenance mode" with very few updates for the next couple years?
Do you want to continually be in charge of DevOps for something that isn't actively being developed for several years, having to ramp back up when issue arises every three months? Is that the best value for the client organization? Or would you rather outsource that? I'd usually choose the latter, and in my experience, it's been a better value for clients.