Zombie reports the day of rage. All the pictures showing them marching down the street, symbolically confronting capitalist institutions, and so forth, show a group of less than twenty, but there is also a photograph of hundreds of people gathered in a park listening to a speech, which gathering looked genuine enough, not much indication of astroturfing.
I conjecture that there were a few hundred people that wanted to see some raging, but not themselves actually be exposed to risk by it. Zombie remarks that in San Francisco, they had trouble attracting an audience.
It looks as though in New York, they were able to put together an audience of a few hundred in Zucotti Park, but the masses declined to confront the symbols of capitalism and finance in Wall Street. Upon marching them out of Zucotti park, the crowd shrank.
According to Zombie in San Francisco, when they confronted various symbols of capitalism and finance in San Francisco, a few stern looks from the rentacops shepherded them out of trouble.