Our customers have not complained one bit. Our contract states in time of drought I make the descision as to whether or not the lawn gets mowed. It also states that no adjustment will be made if lawn is not mowed.
This covers my company as well as the customer. For ex. in the spring when the lawn needs cutting more often they know they pay the same amount so now they do not fuss.
I think you should stop feeling quilty for your prices and start looking at it from the standpoint of making money. After all isnt that why we do it?