A friend of mine made ~50k in 6 months as a Bicycle taxi person. He had to put a fair amount up front to buy a few "taxi's", then hired some other guys to run those while he ran his own. The hours were not 9-5, more like 5pm - 1am. With the other people in his employ he was able to take time off and the like.
Of course he had to put in physical work and dedication to the company. At the end of the summer he sold his taxi's to a competing company and walked away with just over $50,000. I think he put down $20,000 initially, to buy all 4 bikes and carts. I don't remember what he paid his employees. They worked for commissions or something, I don't recall the exact business model.
He did this by just driving people around on a bicycle towing a cart. You got to work with interesting folk, and get fit doing it. Plus you made money. It's a win-win!
