I agree that this is how some people think. I did an estimate for a guy the other day for his lawn maintenance. After I gave him my written quote he told me that his last year guy has half my price (Mind you that the "last year guy" was using the homeowners equipment). After a few minutes of talking with him he told me that his guy would get paid for the work done and ask for next weeks pay in advance also. Then he said that the guy stopped mowing for him and started sending his nephew. He ended the conversation by telling me that the guy stole his blower and after all that he was considering hiring him again. I reminded him about my written estimate and that if in the future he needed my service not to hesitate to call. These people you speak of tend to work themselves out. The problem is that there is another one right behind him.