passfan: That’s a question you would need to ask a specific shadchan in a specirfic instantce, but these do occur. Feelings are hard to measure and understand but if someone has a tayna and it’s somewhat justified its not such a great thing.
Here’s one such example. Suppose you spent 3 years working very very hard for a specific single who didn’t have a easy time in shidduchim. Your were succesful and made their shidduch after putting in huge huge amount of effort. They compensate you at the low end of the shadchanus range (say 1,000 and the upper end is 1500 or whatever it might be) and then they go ahead and make a extremely lavish vort or wedding. I could see a shadchan being a bit hurt.
Spend freely on everything else but skimp on the shadchan, that might be hurtful… and perhaps the hurt would be somewhat justified
(for the record as i’ve said numerous times, i’m not a shadchan)