I haven't seen the Fight Club so I'm not quite sure what you mean. I hear it's good though, I have to look into it.

As far as a cult thing, the most crucial thing is the initial first few steps. If they can get you to at least look at it, they've already started you down the path. Those with the greatest chance of breaking out are those who do so early. The same was seen with an experiment involving delivering a "shock" to a patient. A person would deliver a shock to a patient, increasing the voltage at the insistance of the alleged professor who was conducting the research. As the patient began to shriek in agony begging for them to stop, the researcher would keep insisting that they continue. Most of them went through all the way to the end, despite the agonized shrieks from the patient, though many were visibly distressed at doing so. In actuality, there was no shock, the patient was merely acting, but it is quite interesting indeed. Those who did not carry through with the experiment usually stopped early on.