I am 17 years old and am absolutely addicted to lawn mowing! I have slightly more than 15 customers and am doing fine in my little business. However, when I am driving around gawking at all the big business, I notice that only one person is mowing the lawn, yet they have two big mowers. I have one big commercial Exmark Mower and one small walk-behind. So, why does one person need two big commercial mowers?