I recently stumbled upon this article about how taxis in Las Vegas overcharged patrons by $15m dollars last year. A number of years ago I had flown to Vegas for a conference and jumped in a cab to the MGM Grand. For many people who have been to Vegas, they know the MGM Grand is basically on the Northwest corner of the airport.
Well, the cabbie decided to take me the "long" way, in other words, he headed out east of the airport, then south to the highway and then back up to the MGM Grand. What should have been a ten minute cab ride ended up being 30 minutes. Since this incident, every time I get in a cab at Vegas, I make sure they take the surface streets and not the highway.
My last trip to Vegas i mentioned this to the cab driver and he admitted that the cabbie's do that since the airport fees are so high and many tourists don't tip or undertip. So the cabbie's feel they have the right to do that.
So, the next time you find yourself in Vegas, make sure you don't get take for more than a ride then you need.