Corrupted gear can drop from a variety of non 8.3 sources. And that's one of the annoying aspects of this patch, you're gently coerced into generating currency to cleanse those otherwise perfectly good items. I do see where they were going with this.. the tradeoff between how much corruption you're willing to tolerate vs increase output is a neat one, and it makes perfect sense for players who want to hop on the horrific visions hamster wheel.
For everyone else, not so much.