Using vets not listed on Arav website?

My herp vet isn't a member, but I've used him for 15+ years. (Disclaimer: I worked for him for awhile, covering an office maternity leave, but was a client for several years before that.)

Just do your homework; is the vet you want to see actually a herp vet, with Board certification? I would look more at certification and experience, than membership in the association. (I think my vet is too cheap to pay the dues, but is very good at what he does!)
There are three exotics specialists near me but only one is on ARAV. Nothing wrong with the other two at all, they're just not listed.