I think it depends on the owner. A checkup is always good, especially if you just acquired a new snake, but many people will seek out a vet only when needed.

As far as finding a vet in your area, have you tried contacting local vets and asking them to refer you to someone in the area? I checked on ARAV and Herp Vet Connection, and you're right about none being listed in your area. Hopefully a local vet will point you to someone that isn't on the list.