Harry Potter Capslock Revisited

[sweettalkeress.livejournal.com]

So a lot of us now have talked long and hard about how there's a ton of capslock in Harry Potter and how that's the sort of writing you'd expect from amateur fanfiction. Recently I was reading a random blog post for a bad novel and the writers of the blog were commenting on how there are some versions of capslock more excusable than others, and that the capslock in Harry Potter was an unusually good example of how it could work (see Molly Weasley's threat to Bellatrix, DH). This was compared favorably to the use of capslock seen in hack writing such as, for example, the following sentence from a bad novel I actually own:

"That made Thunderbark EXTREMELY angry."

Note that this is not a line of dialogue.

So what do all you guys think? Do you think Harry Potter's use of capslock actually works at any point? Do you think there's any way it could work in published novels, or should it remain a mistake of amateur fanfic authors?