A business that needs more staff to service more customers is still scalable, as long as each staff member generates more revenue than they cost. McDonalds is awesomely scalable.
If you insist on limiting yourself to zero-touch businesses, you'll find yourself competing with all the other geeks who are afraid to go out and sell and build business relationships. On the other hand, if you're willing to build high-touch relationships, you'll discover opportunities that you would have never otherwise found.