Yated Shidduch Forum 3/19/21: The Shadchan Told Us We Have “No Chance.” What Now?

Question:
My wife has a sister who has been in shidduchim for over four years. We work tirelessly to try to get her married. It has happened numerous times that when we contact shadchanim to redd a certain shidduch to the boy’s side, they refuse to even redd it, claiming that we have “no chance.”
Is that the way it is supposed to go? Should we not be trying for the qualities my wife’s sister is looking for in a boy because “we have no shot” anyway?