Hi,
It's not so much they don't like to climb it's that they are heavy snakes when they get bigger and tend to fall off a lot.
I always worry they are going to land on the edge of the waterbowl and hurt themselves or something.
Just because an animal does something doesn't mean you should let it - Elvis was known to eat the occasional cheeseburger and we all know how smart that turned out to be.
dr del