Like I said, the accommodations necessary would vary by species. A non-venomous snake can be kept in an aquarium with appropriate food, moisture, and temperature, and live very happily–but it’s never going to be “tame”. An alligator can be kept in a pond and thrown chunks of meat, but it’s never going to be tame, and when it’s small it can take off a finger, when it’s bigger it can take off a hand, and when even bigger it can rip your leg clean off.
A wolf can be raised just like a dog. Except your tame wolf will challenge you for dominance whenever it senses weakness, so you better know how to play alpha, and you better have plenty of room for your wolf to exercise, and leaving your wolf chained up in the backyard for 10 hours a day while you go to work is a bad idea. So you need a lifestyle where you’re home all the time, you’re engaged socially with your wolf all the time, and you’re mentally and physically tough enough and savvy enough to head off most dominance games, and win the ones you can’t head off.
Likewise, a tiger can be raised just like a housecat, and will be almost as tame as a housecat. I’ve gotten clawed by plenty of housecats, and nipped painfully. A claws-out swipe from a 10 pound moggie leaves a nasty scratch. A swipe from a 300 pound big cat can leave you with a broken neck. The tiger will see you as a surrogate parent, and probably doesn’t want to kill you, any more than Mr. Bigglesworth wants to kill you when you rub his ears wrong and he swats at you. Except when Mr. Bigglesworth does it you don’t go to the ER. And you can get surplus tigers easily, if you want one you could easily get rescue tigers for free–if you can prove you have the facilities to care for it, and prove that you’re not a nut who doesn’t know what he’s doing.
And a monkey is very much like taking care of a hyperactive two year old human, who can run like the wind and climb anything, and can never be housebroken. And will require just as much supervision as a two year old–for the rest of the monkey’s life.
A squirrel would be pretty easy–kind of like taking care of a rat, but a rat that likes to climb.
And a shark will require—well, you get the idea.
Every different kind of exotic pet will require a different lifestyle adjustment. If you’re not willing to make the sacrifices to give that exotic animal a decent life, it’s crazy to become an exotic pet owner.