Why would someone be interested in starting a worm farm? Nowadays, there are many people that are concerned about the environment. Worms fit right in because they provide fertilization to the earth.
The downside of that is there are not as many around. The chemicals that farmers use help to grow their plants. These chemicals do not agree with the worms and therefore they die off the face of the earth. However, there is an underlying picture: using worms would also help plants to grow naturally.