Simple Savings

I can't understand why people would not want a rain sensor on their sprinkler system. Could it be the initial cost of the sensor?
Nothing wastes water more than watering turf when it is raining. Most rain sensors can recoup their cost in the first year of operation. The sprinkler guys who don't install them are doing a great disservice to their customers and the irrigation industy as a whole. Some local municipalities are forcing the residents to save money by passing legislation requiring rain sensors. Do we really need that? Why can't the sprinkler guys just include them in their price? Here again, the problem seems to be the builders. If it costs them an extra $75 to include a rain sensor, they won't spend the money, which is a great disservice to the home buyer.
Maybe the answer is with the manufacturers who make the controllers. They should include the sensor with each controller and make the controller dependent on the sensor to work.