I think many here are confusing why you quarantine new animals. You don't put them in a QT tub and just feed and forget them for 3 months. You must look for issues to develop. Look for the ticks and mites. Examine the scat for worms/parasites. When you quarantine, you are acting like a doctor. Looking for issues to be brought to your attention.
I've found that almost exclusively, a sick snake comes from a bad breeder. Many times flippers will have issues too.
The most important rule I would recommend everyone follow is to know your breeder. Get references if you're buying through the internet.
Just my opinion,
Jim Smith