My thoughts:
The vast majority of JW's are so uneducated.....and most of it is by CHOICE....they love ignorance. It's comfortable for them. I think a great many subconsciously know it's all a lie.....but crave a sense of belonging. Therefore, the depression that runs rampant through the 'organization.'
It is nothing more than a semi-brilliant (all religions employ this methodology) pyramid scheme. It took off during an interesting time in human history, particularly the western world. It grew mostly among disadvantaged people.