We sometimes set our prices according to the venue. When we are vending at the races at the Laguna Seca Raceway we charge a lot more for food. But then the racetrack charges us $2800 for a spot for a 3-day event. When we are vending for a festival in downtown Gilroy, a fairly small town, with local restaurants, and they only charge a couple hundred dollars to vend there, we don't charge nearly as much as at the races.
All that being said, we do try to sell at a good price, not overcharge, nor undercut other vendors.
Rollin' Smoke BBQ - West