Well, Snape himself was bullied, and earlier in the story he asked HP to stop a bully, so I'm guessing he orchestrated the fight to raise the reputation of SPEW and marginalize the bullies. It was mentioned that a first year wouldn't be able to break the protego spell, so perhaps he helped out?
This would, of course, mean that he delivered the letters and/or orchestrated the "prophecy" as well.
As a side note - it's been so long since the last update that it took me maybe 1/4th of the chapter to fully understand what's going on. Perhaps I should have skimmed 71 before reading.
Final side note - Eliezer, what do you think of ASOIAF?
FFSN - On the whole 'forgetting the story' theme - who was Rianne?
Rianne appeared in the previous chapter when Snape offered her fifty Galleons for something that, much to her dismay, was probably not sex.
As for Snape's goal, maybe the Head of Slytherin House has his own, in-character plan to restore Slytherin's reputation?
Update: Discussion has moved on to a new thread.
The load more comments links are getting annoying (at least if you're not logged in), so it's time for a new Harry Potter and the Methods of Rationality discussion thread. We're also approaching the traditional 500-comment mark, but I think that hidden comments provide more appropriate joints to carve these threads at. So as of chapter 67, this is the place to share your thoughts about Eliezer Yudkowsky's Harry Potter fanfic.
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: one, two, three, four, five, six. The fanfiction.net author page is the central author-controlled HPMOR clearinghouse with links to the RSS feed, pdf version, TV Tropes pages, fan art, and more, and AdeleneDawner has kept an archive of Author's Notes.
As a reminder, it's often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: