We dont' do leaves to make money. Not very much money to be made in leaves.
I started doing when I was solo because people were asking for it, and if we didn't do it then someone else would. And chances are good that someone else also mows. So we don't want to risk our customers having the competition on their lawn.
Now that I have 4 employees. We basically only get about 2% profit on leaves. I have only kept doing it and advertising it is for my employees. We normally stop mowing round the first week of November. Leaves keeps us busy through the middle of December. So we get over a months worth of extra work out of leaves. Customers are happy, Employees are happy, and I keep them off unemployment for an extra month. So while they job sucks, we don't lose money on it.