Why do some people return their ball pythons?

[1kgd915]

I've had everything handed to me because of every excuse known to man. Fish because they didn't realize the upkeep( no mary, you can't keep a betta in a small bowl and it magically not get filthy bc everything poops, or so the book says!). Reptiles because they moved, get in a relationship that freaked about it, they had a kid so they can't have them bite, roommate got a cat, new landlord said no, why is it so expensive(when they started out wrong, bought wrong again, and again).
Update of them all: goldfish in a 150 gallon pond with turtle(Quasimodo), betta (pretty fish)in 10 gallon aquarium, tortoise(brother thought to keep outside in co) and Chameleon (bought for a 4 yr old)was given to educational program, unplanned litter of puppies adopted out but 1(now duped Honey and my recent family addition), birds given to education programs, it doesn't sto there either
Really wish people were more reliable or came up with plan b that wasn't, well then not my problem anymore.