[speed_spread]

This being Vegas, they should make it possible to bet that you'll

- get lost

- be late

- collide with a moving car

- collide with stationary object

- run over a pedestrian (bonus for multiple!)

[tim333]

They could install a roulette wheel or slot machine in the cab to be in keeping with Vegas.

[wedn3sday]

You can always do some sports betting on your phone while your getting driven around.

[cosmicgadget]

It should coerce you to go to a club where it can get you a special deal.