And how is that related to psychology? Simple, people aren't looking in the right places for the data they need in order to find out what really works. People get too caught up thinking about one strategy that they don't think that something else might work or be the answer.
Even look at how people are on different web sites. Try posting on a few sites and you might see. Or maybe you already have. Each one has a certain mentality as to what methods they believe in, and often they don't think that maybe they are wrong or maybe something else could be better. I think people need to be a little bit more open minded when it comes to certain ideas.