In the poorer parts of Asia (such as Cambodia), there's a variation on this. You walk out of your hotel, intending to walk around town and see the sights on foot. At least half a dozen taxi and tuk-tuk drivers standing outside the door will ask you if you want a ride. As you walk away from the hotel, others standing nearby will join in, even though they've just seen you refuse half a dozen of their competitors who offer the exact same service at the exact same price. I have no idea why they think you'd chose them after turning down everyone else.