Why can not create people power in the machines so they can burn books and get paid for it?

I know it seems that this does not happen a lot, but it seems ever new ways to make it effective. I wonder even if a giant hamster wheel with a base of walking for 2 hours and $ 8 would be beneficial. offs pay three: more energy, more exercise and a little money to promote exercise. Why not?

A good man can usually generate some less than 400 W of power for a few minutes: To http://en.wikipedia.org/wiki/Human_power provide energy demand of land for 3 minutes, would be 37.5 thousand million people. To provide a constant power, this guy has been tested and found can be held in 60W 5h: http://www.los-gatos.ca.us/davidbu/pedgen/stats.html If there were people making changes 8h / day, which needs 750 000 000 000 250 000 000 000 people with bicycles at a time to provide the energy needs of current 7 billion people. The power is so low that it's really not worth it. 8:00 a.m. Working ~ 60 W 4.8kWh generate output, or about $ 0.50. I do not think many people work for 6 cents an hour!

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