Apparently you have never sold to a fortune 500? Many require bug fixes only of your app for X years. They don't care about new versions. Nothing about faith but about their priority. Using the latest and greatest is not their priority.

We were selling to Fortune 500s.

The upgrade paranoia only kicked in when they were subjected to broken releases and had to roll back.

The F500 is incredibly varied in their requirements even within the same company. I've seen demand for new features and long term, keep-everything-the-same-as-day-one from the same group for different services / products. Paying more money to keep things from not changing or for not adding features is something unique to enterprise environments though.

Well, sometimes the lack of stability is purposeful - new features are added, old features are deprecated, etc. How do you deal with that?