If it's anything like dogs, then yes, the extra toes are a result of inbreeding. It would be wise not to continue with that. I get pissed off when I buy a dog with extra toes, but at least THOSE can be surgically removed without trouble. Geckos are a different story altogether though 
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Innocent as a dove you will harm no one, but wise as a serpent no one will harm you. - Haug

