I generally think the same these days, but it made me recall 10-15 years ago when I was consulting and considered a company having no source control a place where I could provide immediate value. Now it just scares me right out the door.
It's funny how quickly that's gone from, "Oooo I can help you!" to "you guys are helpless."
The value is also depending on them understanding why it is useful. And if they do, would they not use it already?
They are in a mess, they hire you as a consultant, you explain VCS, they get it, everybody wins.
They didn't have to understand in advance. They just had to be smart enough to know they needed help.