It is funny how many people think that you only go to lawyers to deal with existing problems.
I had many satisfied clients who came to me for advice about how to avoid problems, and how to be in a good position to deal with them if they should arise.
The most valuable thing I had to sell was advice.
And a lot of people who dealt with my clients also appreciated my advice, because they too benefitted from having issues raised and understood and agreed upon before they became disputes and problems.
And while there are lots of perfectly enforceable contracts out there that haven't been reduced to writing, that really increases the chance of misunderstanding, particularly if you are dealing with organizations where the individuals involved can change.