I think its generally on the high side, but if you are the only MG rental in town, you pretty much set the price.
I remember being a teenager and going to a lecture by trumpet & trombone player Rich Matheson and he said for a while he played tuba because his band instructor father made him play tuba in high school band. Not much later in life he found out if you were the only one in town that could blow jazz on a Sousaphone, you were guaranteed to have a job.
I think Vegas has 2 things lowering the price ... the volume they do and some competition in the neighborhood.