Sometimes, dealing with certain people is just not worth it, no matter how much profit is involved. That is one advantage of owning your own business. In my experience, once a pita, always a pita. Often the best approach is simply to kick them to the curb as soon as you realize you are dreading it when you drive up in front of their house. I had one for two years, that used Roundup everywhere. He had a 2 foot bare patch around his house, and would sweep this with a broom. It was nice to have limited trimming, but when it got dry, by the time you got done mowing, you and the mower were covered with dust. He wanted it cut as low as possible, his driveway was a pain to get my trailer into, and he was always griping about something. The final straw was when heavy rains were forecast and he wouldn't let me mow 2 days early (he was on a 10 day schedule). After I dropped him, I wondered why in the hell I put up with all that crap for as long as I did. He called several times after that, leaving messages on my machine, wanting me to come back, but I never returned the calls. As for the "mowing lower" thing, I absolutely will not go lower than 3 inches, and that usually is only on a portion of the lawn, and only during peak growth. Normally I mow at 3 1/2, and if a customer asks for it to be mown shorter, I just say "sure" and drop to 3 1/4. I've only had a couple ever say anything further. Last year, we were in a drought, and on the larger properties, I worked my way up to a full 4 inches as the drought progressed. I was mowing well after nearly everyone else in this area was done, albeit on an longer interval between mowing, and after Isaac dumped 3 inches of rain September 1st, it was like spring all over again within a couple of days.