Ive been to different Foreign Exchange seminars (once I was a noob) at which the teacher would teach a number of his trading techniques and methods. Then they'd insist on registering non-disclosure agreements since the more people use this techinque (ie simple MA cross, or doji candle. Crap everyone can find out on there own) will dilute the signal

The instructor will claim that the more people who followed a specific technique the less it would work. Was this a method of tricking the noobie attendees in thinking that this was something great and must be maintained a secret or would be that the instructors statement valid?

I thought that if you were buying, and others bought also, it would add rather than remove from direction.