Please allow me to rephrase the concept of the original poster.
Wouldn’t it be a appropriate frame of mind if after my child goes out on numerous dates (even if it doesn’t work) I ask my self the following question.
“What should I do to compensate the shadcahn for all the time and energy he/she devoted to try to bring my child to the chuppah?”
Perhaps there will be cases were the answer is they don’t deserve anything, and if that is the specific parents decision – it is very fair.
BUT AT LEAST – ASK THE QUESTION!!!
If all parents of dating children and the daters themselves asked the question, you can be sure many many times the individual answer will be something along the lines of the original OP’s suggestion.
ASK THE QUESTION
don’t be a chazer