I feel what Bob Jewett said bears restating: there are two kinds of "secrets" in pool: secrets that aren't secret at all, and secrets that are false. Many "secrets" even fit into both categories.
I'm a B player with a solid understanding of the physics of pool, and I play frequently with one or two A players who don't understand the physics. One day, I got to be close enough friends with one of these A players, that while I was shooting he decided to show me another, "secret" way to execute a certain top-spin shot with extreme inside english, that I had just failed to execute correctly. He said the shot was too difficult shooting it conventionally, but he had found a special stroke, through hours of practice, where he could stroke hard with low right, but the twist in his wrist would reverse the english and consistently execute the shot.
So I watched him, and he did line up with low right, and he did this funky stroke where he twisted his wrist, and sure enough, he got the 3-rail shape I had been trying to get with high left. I told him he didn't hit the ball with low right (because I knew that the wrist-twist couldn't possibly do what he was claiming it did), and set the shot up again, using a striped ball as the CB. He successfully executed it again, and I showed him his chalk mark, and made my point.
"Secrets" don't have to be true to work for the people who think they "know" them. The ones that are true are readily available if you just study the game.
-Andrew