My experience with Market "gurus" is that it is the "groupies" who create the "guru".

without "groupies" no gurus.

I was very disappointed in WEC 2011 in Philadelphia. I discovered that 99 % of the attendants were satisfied with MA prestations.

I assume it is the social approbation trick + the fact they have paid a lot of dollars

IMHO that is the second trick : the more you pay, the less you can accept you have made an error and wasted your money

hence you list all the "rational  " reasons explaining , justifying why you have not wasted your money.

My personal cost was my share of the trip , around 500 euros , which is reasonable for a 4 days touristic excursion in Philadelphia and surroundings !