Years ago I made a shidduch. They both said that I was right on the mark in arranging them to meet. After they got married I very nicely asked for payment. The woman paid me half and the man said he did not have to pay because I was a friend even though I was more of a aquaintence than a friend. The result was I only got paid 1/4 of the going rate and guess what? They got divorced before the year was over!
Another time I made a shidduch and was not even invited to the Vort. Quess what they never got married!
I wonder how many people have shalom bayis problems or get divorced or dont have children because of not paying the Shaddchan.
After many years of lots of time and money trying to help set people up I stopped not only for not getting paid but for not being appreciated and sometimes even being avoided when our paths crossed.