1) They follow their heart and they are interested in that category.
2) They may feel unhappy with their current jobs and other reasons such as environment when growing up and family pressure
3) Not making as much money, getting fired (because its an unconventional job, may be mistaken as a downgrade), being looked down upon
4) Depends on the job : eg funeral directors will need to know funeral rites
5) Flexible but can be very tiring if not managed properly
6) You get to enjoy free tickets to the zoo for yourself and your family if you are a zookeeper.
7) Most of them are their own bosses.
8) If they are advantageous to me, then I am certainly going to choose that job