While this is interesting, Manhattan is the least useful area for this since the subway is already so good. A dense area with a poor subway system seems more helpful (but I'm assuming less profitable)
Nah, Uber in Manhattan is useful. There's a reason there are 12,000 cabs. Sure, if i'm near the proper subway line to get me somewhere quickly it's great. However, there are plenty of times the subway isn't the best choice.