I was under the impression that said Wizards had their Magic for the Vow extorted out of them by the Noble houses which had both vastly superior wealth and the ability to make them broke. I can't imagine someone willingly giving away their magic unless they had no real choice in the matter. It would be similar to giving away your legs.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 119.
Plans for next chapter release:
There is a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)