Bottle Service

Last Night:
     Last night I went out to one of my friends shows which he does weekly at a small Club in Santa Rosa.  He is a DJ who spins at Club Rapture and the creator of Dance.Or.Die productions.  This club in Santa Rosa tries to emulate a San Francisco dance club and does a pretty decent job of doing it.  It has a dance area with a stage for performances which vary from hip hop performances to DJs spinning.  The club also has a bar area which is separated for nights when events are 18+.  Overall it was a good experience but it brought up a question I always had every time I hear it at a club.  Why is bottle service at a club so damn expensive?