Do Americans tip everybody?
It seems like it. I just got home from Las Vegas, and everyone there has their hand out for a tip. You tip the guy who gets you the taxi (we didn't but we saw that everyone else did), then the taxi driver, the bellman, the guy who picks up your laundry (I spilled sunscreen all over my best outfit), the one who brings it back, the room service gal, the waiters and waitresses, the gal who brings your free drinks while you are gambling, the maitre d who seats you at the shows, so you get a better seat (that works by the way), and the skycap. The friend I was traveling with (we met her sisters there) has arthritis really bad, so got a wheelchair at the airport. The person who brought it and pushed her got a healthy tip too, but it was worth it to get through security so fast.
We spent a few hundred dollars on tips among the six of us. But the service was really excellent and worth it.