1. It is not possible to make 80 meaningful posts in 4 hours. That's one post every 3 minutes. Anyone posting at that rate is really just spamming because there is no way their posts could have any real quality or value.
2. As far as jobs go, signature campaigns don't pay very well. According to your numbers (which are exaggerated), a person can make $3/hour. Perhaps that might be a lot in a poor country, but minimum wage in the U.S. is more than twice that. Get a minimum wage job and earn twice as many bitcoins per hour.