That's probably a big part of it. If you undercharge on some small, one-time job, afterwards you go "Whoopsie! Time to adjust my fees. No big." You undercharg

That's probably a big part of it. If you undercharge on some small, one-time job, afterwards you go "Whoopsie! Time to adjust my fees. No big." You undercharge on some big, ongoing contract and it can feel like you can't make any real changes. And now you're stuck in this bad deal. (Or at least feel stuck.) People tend to not know how to "fire" a bad client and the idea that you can choose your clients, at least to some degree via market positioning, is alien for many people.