Per capita income in Libya is 20 times your estimate at over $14k, and Egypt is approximately ten times your estimate, at $6k a year. Those who want to provoke a mob certainly have the resources to do so, and almost everyone knows someone with a smart phone or at least an Internet capable phone. Libya is the wealthiest African country - because of their high oil production relative to their population.
This was almost certainly staged, possibly all the way back to producing the film, but poverty is not part of the evidence.
Thanks for straightening me out. :) That # I used was based on what I heard on Fox from some on-scene reporter describing the population that was storming the consulate.
The whole notion he espoused that the Libyans were stirred up from what they *saw* on the internet seemed far fetched.