In fact, I was once playing and little did I know, I had a set of aces (AA in the hole, A on the flop). My opponent had a straight, however. We were both trying to bluff each other. In the end, I folded when he "bluffed" all in. We both did not know that we had good hands, but often times a good bet is what takes the pot down.
I do not trust big tournys if they have an audience. In the wsop, do they allow people to watch? And also, players could be working together. There's too much of a possibility of collusion in BMB