I don't know anything about quarantine. Okay, I probably know something, but comparably little.

If we're talking about air transmission, wouldn't separate rooms be negligible if there was a central HVAC system that circulates the air?

How likely is infection for younger animals. Say I head over to a herp show and buy a 4 week old animal. Is it any less likely to be infected than a 4 year old animal?

Not that death is wanted for any animal, but is there ever a cost benefit analysis done? If I have thousands of dollars of snakes in a breeding operation, then of course a year quarantine seems to make sense. But if I am a dad and my oldest son has a BP and my youngest now wants one, does it make sense to spend $50-$100 on tests and year of quarantine for a $20 animal?

What about cross species contamination. I know it can happen, but has anyone heard of this? For example, are corn snakes carriers for pythons or are kingsnakes carriers for boas, etc. Do you quarantine those as well? What about non reptile pets. Do those get quarantined too?