It is to a large extent, but no one is forcing people to buy signals or retarded courses that cost a few hundred dollars easily. Based on that I would say that people allow themselves to be manipulated.

It reminds me of how certain forex groups have tens of thousands of members all having bought a subscription. You can steer these people to a certain asset and long or short it based on your preferred levels.

People are too stupid to understand that these "gurus" selling information wouldn't need to sell anything if they were so good at trading. People need to lose money in order to figure that out I guess.