Yes, I too once wondered this so I read Chomsky on Anarchism (I think just because it sounded like an interesting topic), and came away with the conclusion that Chomsky's intuition was that people were primarily motivated by something like 'solidarity' than was consistent with my intuitions (and generally along worker/non-worker lines). He does also have a habit of being intellectually rude by switching topics frequently and saying things which he should know are false.