I have been cutting grass for 2 years. I have developed a good relationship with my customers, they know me, and I know them. After I was done cutting each lawn the past 2 years, I would collect the money at the door to create a good relationship between us. I would basically get to know them, and make them laugh or smile. Time is money-I know this, but they have my money, I wanted to make them happy the first few years by talking to them, make sure I am in the door real good, and then start being more professional the following years by sending out the bill. I won't be able to suck up as much any more and I haven't had any of my customers sign contracts. I know they won't drop me, but would it be necessary to have them sign contracts, if so, why?