I read the article, but that's not the level of explanation I want. I want to know how, for example, at the scale Uber and Lyft are operating at, the salaries o

I read the article, but that's not the level of explanation I want. I want to know how, for example, at the scale Uber and Lyft are operating at, the salaries of executives and engineers are more than the efficiencies it seems like they would gain. On paper, you shouldn't need to add a linear amount of overhead every time move into a new city: with taxi companies, you have to add physical buildings, admin, dispatchers, service personnel, and a bunch of other costs every time. You'd think Uber and Lyft could be a lot leaner than taxi companies, even though engineers make more than dispatchers: why not?