Why do herpetologist milk poisonous snakes?
The anti-venom for many poisonous snakes, as well as a few other
medically valuable substances, are made from the venom of poisonous
snakes. Also, if someone has to handle poisonous snakes regularly,
if they are milked on a set schedule, it reduces the danger of a
bite from one of the snakes - the venom injected would be a tiny
amount of normal.