Hypothesis: Aurors simply put alarm spells in large repositories of gold.
(This may not be widely known, because everyone who realises that muggles can be stolen from does so and is jailed.)
It doesn't matter that much if some wannabe thieves get caught. Only one thief needs to succeed per vault per century to make all the Muggle gold disappear. An alarm isn't enough against several wizards who take the time to prepare a raid. Only a round the clock guard would be enough. If Aurors guard all the big Muggle gold vaults (or that the goblins or their dragons do), that might be a sufficient deterrent.
What isn't clear is why they would install alarms or provide guards, instead of just taking the gold themselves.
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 97. The previous thread is at nearly 500 comments.
There is now 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.)
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: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25.
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: