not a question that anyone can answer. Snakes don't exactly fill out surveys, you know? A small percentage of all kinds of snakes may fail to thrive, but
with ball pythons, it's most often due to improper husbandry by owner. That includes caging mistakes & excess handling, even offering the wrong prey or
prey size.
Meanwhile, making sure that you're following recommended guidelines here will help keep you & yours out of that category.
The way snakes are portrayed in movies [especially horror movies] makes you think they are ravenous psycho-beasts, but in reality most ball pythons are more
like Mr. Ed. (for you youngsters, he was Zina's horse on tv show "Mr. Ed")