Why are Witch Belts still sooooooooo expensive?

Uh-uh! 60% that the Chaos Scroll does something. If that 60% passes, there's a 50% chance the scroll adds stats, 50% chance the scroll removes stats. So it becomes 30% chance for it to work positively, 30% chance for it to work negatively, and a 40% chance for it to do nothing at all.

....? Doesn't the chaos scroll have a 20% chance to blow up the item, though?