As for my bar... when you bite the hand that feeds you, I'm going to point that out. It speaks directly to your credibility. Engels took advantage of family connections and turned around and pissed on what his family connections gave him. It's no different than a person on welfare claiming that welfare should be abolished. You are free to construe that as an ad hom, as you are free to be wrong about anything else.
I don't know the numbers but the amount of actual protestors in a movement is always going to be small. But Occupy spread spontaneously without an organization to over 600 communities in the US, thousands worldwide.