Trading off driving when everyone is a zombie is frightening. Setting up the sound system, merch table, and video gear is trivial compared to finding and training volunteers to handle any of these areas.
In Austin, where classic venues like Emo's and Antone's have been forced out of their downtown locations in part due to rising operating costs, music festivals can be seen as a partial if not a root cause of less patronage to these businesses over the last decade before their closings.
Polling is a practice where venues itemize concert-goers according to who they came to see in order to determine how bands are paid. It has nothing to do with the actual job performance of show-rocking.