Very interesting!  In the US we have more expensive cost of living and our minimum wage varies from state to state but if we use the federal minimum wage ($7.25) and an 8 hour work day that is $58/day or roughly 7 millibitcoin per day at current prices. Over 30 days would be 212 millibitcoin per month but that is assuming a person worked every day with out taking weekends or other time off.