i have a few routes very far from where my central location is. I started them by finding one reliable guy I can sub work to, then advertising. When the accounts are built up enough in that area, years from now the hope is to put in a permanent location there. My farthest route right now is over 2 hours away....I have never met the clients personally but they send pmts right away when billed. No one has cared that I am not in their immediate area....only that my lawn guy (my sub) does a great job and they are happy. It's crazy but it works and there is no area too far away from me which means i have income coming in from every direction and i am not limiting my income because "it's too far to drive".
Best of luck. I believe secondary locations add some security to your business.