I just read the following post in the Las Vegas forum, comments?
For the people that say "I'm not tipping for someone who just whistles for a cab for me", the job is more than that. He keeps order in the line and keeps things running smoothly. I just returned from a visit to New Orleans where some of the big hotels did not have someone doing that, and trust me, it's worth a buck tip. In New Orleans you had people running up to cabs and cutting in lines, cabbies trolling the line for airport fares and ignoring people going shorter distances, all that kind of nonsense you don't see in Las Vegas.