Quarantine is a risk mitigation. Your quarantine process should be appropriate to your situation, your snakes, your goals and your budget. I had one ball python, then I bought 3. For me it would have been silly to quarantine 3 new snakes to keep them away from the one, especially when the one was not a super expensive snake. And in this situation I'd be doing a lot of rearranging and it'd be a lot of hassle to prevent a snake from something that there isn't a huge risk of anyway. At this point my biggest risk is a vet appointment and treatment for a few snakes. Now 5 years from now I'll hopefully have a collection that's worth a bit of money and is a considerable amount of snakes, at that point I will for sure have a rack across the house for new purchases and have a full quarantine process in place.