Although the V.I.N. membership cost is particularly high, keep in mind it is a *massive* network for veterinary information and due to this, the potential cost for a client who may have an obscure case might go down significantly. Mostly since it is easier to diagnose inhouse, without multiple referrals. This also means more money for the practice.
Every doctor I've met, in Chattanooga, uses V.I.N. religiously...mostly stating the pro's highly outweigh the con of the cost. IE: Less time pilfering through books, calling local specialty clinics or old mentors, a drastic reduction in case-study time, and its generally a good place to go for an idea if you are having a brain cloud as to what to do next.
So $~700 bucks a year may seem expensive at first, but the potential it can earn for you, or even just the potential of which it can affect your efficiency is quite large.