Happy Girl & AZ:
A lot of boys do not go to shadchanim because most come away with a disgusting feeling. I personally do not go to shadchanim. However, every time one of my friends goes to one they call me up and complain that it was the most demeaning encounter they ever have had. They come back feeling like they were stripped down, examined, and then thrown in to a dark place somewhere. The swear that they lost 15 minutes or half an hour of their life which they will never get back. This gets around to all the other boys and we avoid that shadchan (and this happens almost to every single one).
Perhaps if shadchanim do not turn the meeting into a butcher sale where they poke and proud the meat then maybe more boys would come to meet them.