One of the problems that the products face is that customers are going to ask, "Why can't you show me the statistics that X offers?" And if you try to say that it is statistically impossible to really offer that, they will tell you, "Well X does it, and they are smart. So you must be wrong!"

A classic example is that when Google put together Visual Website Optimizer they included a heuristic for the chance for each version to beat the control. This heuristic was statistically wrong. But since Google offered it, everyone else figured out Google's heuristic and did the same thing.