Monkeys are a labor-intensive pet choice. It’s much like owning a toddler for 20 to 40 years, which is their life expectancy. Homes must be monkey-proofed and care taken when visitors are present in the home, as monkeys are curious.Most monkeys must be diapered or cleaned up after; fed, and played with often. Because of their curiosity, monkeys are considered endlessly entertaining and even thought-provoking to their owners. Monkeys cost between $4,000 and $8,000 each, depending on the monkey’s age, rarity and temperament. Younger, more rare and friendlier monkeys tend to cost more.