Firstly there is no inyan of paying a shadchan until it is a done deal. One must pay the shadchan before walking down to the chupah.
Secondly one of the largest problems today is that people don’t want to get involved. There are many HS’s and Seminaries that do not respond to inquiries about their students or give a pat answer “Do you know how many girls go through these doors, do you expect us to know all of them?” To that I say “Yes you should”. Every HS and Seminary should make it their business to have a liason for each and every graduate before graduation. They should keep a file on each one with a photo (not for public viewing) to remind them who they are talking about.
In addition Roshei Yeshivas should also appoint a liaison for the bochurim in their Bais Medrash. I have also spoken to many that each and every shul should have a shidduch committee to meet with potential prospects and have files to be able to redt shidduchim with other shul groups and also be available for information. Who knows these kids and families better than their own shul family who watched these kids grow up? Who are more vested in the success of these kids than their own kehilah?
It would be a good idea if representatives of various shuls met a few times a year to present their prospects. IMHO I don’t believe there are enough shadchanim around. More and more people have to get involved and do it the right way according to Torah guidelines and with the assistance of a Rav.