I would imagine locations are somewhat "sticky". Your local auto repair shop isn't interested in booting their vendor for another one that charges 65c for a sod

I would imagine locations are somewhat "sticky". Your local auto repair shop isn't interested in booting their vendor for another one that charges 65c for a soda instead of 75c, as long as they're not getting bad service. And they're not interested in the conflict and confusion of allowing a 2nd operator to put a competing machine right next to it at a slightly lower price.