quarantine is a good practice. For example, I had 5 snakes come from 2 different people, and they were all quarantined separately from my collection, until a fire in my building forced a quick move of all my animals to a friends place (which had limited space) and all my animals were placed together. My collection was clean, but one of the breeders that the new animals came in on had mites, and they spread quickly throughout my collection.

So yeah, quarantine is important.