I wish that were the case, but more is not always better in searches. On some of the searches I have been on, they have to surreptitiously weed out people who will not be good searchers. (for example, a bad searcher can be worse than no searcher, because you think an area was covered, but they were too busy chatting about how EXCITING this all is to have actually looked at anything, or someone who really cannot walk well enough to keep up or go the distance). It also depends on the organization of the search. People should be trained on how to walk together so you don't miss any areas, how to approach something that might be evidence, how to mark it, what to look for that could easily be missed, what the signal is for when you find something. You can't really just gather a bunch of people and say "Go look over there." Well, you can, but it might not be effective.