It's possible the only people who deny it works are one of two things. 1. Too brainless are unintelligent to figure out how to make it work, or 2. Using it as an exploit of some sort and abusing the use of it and denying the claim of it doing this because they fear Blizzard may take away their cheating tool. Either way it's certainly good to know this so you can hopefully spot people doing this and prevent them from getting the advantage from it