Why do people in a neighborhood (who are neighbors) prefer to have their own lawn care service and don't use their neighbors lawn service?

I do lawn care and noticed that everywhere that I have customers that each home has its own lawn service that is different from their neighbors and was curious what might be the reason for this?

you would THINK that neighbors would use the lawn service their neighbors use ? or why not?
Update: THIS MUST BE A KIND OF PROOF THAT PEOPLE REALLY DONT TALK TO THEIR NEIGHBORS OR EVEN HAVE ENOUGH CONVERSATION WITH THEM TO ASK WHO THEY USE AND IF THEY DO A GOOD JOB AND HOW INEXPENSIVE THEY ARE? WHY MAYBE? OR IS IT SOEMTHING ELSE MAYBE? WHAT? WHY?
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