Seth Godin had a great post recently -- a video showing a guy dancing, then two guys dancing, then... well, watch for yourself.
Seth's point is the first guy is very important, and the 3rd guy is very important, but Guy #49 is pretty much a dime a dozen. I'd like to put in a word for Guy #2 who took a real risk by joining Guy #1. He could have been rejected, but he joined in and believed in the movement. Guy #3 gets credit for the big wave but maybe there would not be a Guy #3 if not for Guy #2? Read Seth's comments at http://sethgodin.typepad.com/seths_blog/2009/06/guy-3.html