Has anyone ever tried answering the objections you listed with some form of compensation? My understanding of human nature is that people don't like to trust strangers and take what are for them risks if there's nothing to be gained from it and some (even if unlikely) potential loss.

Just imagine going to one of those meetings and asking everyone in the room to do a trust fall exercise. Even if the thought that you wouldn't catch them is totally unfounded, I bet you wouldn't be able to get a plurality. :-)