It's probably for people who still haven't hacked yet. That, or they were having problems before. I needed to get two SD cards for the Twilight hack. Nowadays, it's a lot easier to hack so if anyone failed on their first try, it may work with this method.
EDIT: I just realized this could be the new Twilight hack. Think about it, if you put the HBC installer in the root instead of Gecko OS, you can install HBC. Now if we discovered this months ago, imagine how crazy people would go. Well, that's two exploits that Ninty have to patch up. Actually, can this be patched at all (in a firmware update)? I think the bug is in the ISO itself.
EDIT2: 99 replies, 1999 views.