All in all in some countries ball pythons are collected with care and done responsibly, in others there is little regard to how many are collected.
Bottom line though is, don't worry about. Far more are probably killed for meat and leather than are collected for the pet trade. Besides that, if they banned the import of ball pythons into this country then all those pythons will just end up in Asia as food. They will be caught and sold no matter what, whether it's as pets or food.
Thanks so much for the references. I've been meaning to get those books, maybe I will ask somebody for it next Christmas. But I certainly wasn't suggesting we should ban the importation of pythons, I would never want that. I was just curious is all.