Without a controlled study that provides evidence that snakes who drink from disposable cups are spared a significant risk in comparison with those who drink from ceramic bowls, i will continue to think of people who use disposable as incredibly selfish, and will favor the less wasteful breeders.

If you're referring to the big breeders that i know, you're also talking about people who feed their snakes live prey. While i have no problem with that, there is a risk associated with it, which they are happy to take. I don't think it's a matter of risk mitigation with the waterbowls so much as convenience. A dishwasher makes the risk a non-issue anyway, and it's cheap and easy to use, so there really is no excuse for all the waste.

Hopefully they at least recycle.