i think that you ought to be careful when locale breeding to maintain genetic diversity as much as possible, by breeding wc animals or animals from known separate bloodlines.
a degree or two of inbreeding is probably not a problem (like breeding sibs or breeding an offspring back to a parent) unless of course there are lethals present, but if you line breed multiple generations away from the wild stock, you really loose the genetic diversity . . . and the snakes represent only a fraction of the possible genes present in the wild . . . and are as much a product of selective breeding as any blizzard corn.