yw613: Charging per shidduch offer is a great way to pressure the less-wealthy into marrying whoever just because they cannot afford to meet the right person.
From what posters shared on this site, and my experiences of being set up, there is already enough pressure to make it work with the wrong person (emotionally unhealthy/etc/identifiable-concerns).
I think that the shadchanim should send those who are not ready or have other issues to therapy or give them direction on how to prepare themselves for marriage.
Even if he or she has the money to pay high shadchan fees, it doesn’t help those who are serious, ready, and healthy for marriage to go out with unavailable wealthy individuals.