Simplest; The goblins, and wizard society just do not approve of outright theft, even from muggles, and there are magics that will reliably mark stolen goods. So if you want to come up with gold by the tonne, you need to either actually engage muggles in trade (eewww) or go hunting for treasure with no (living) owners.
More amusingly: I am not at all sure competent wizards have much need to care about coin at all. Lucius is a political creature, so he needs ways to bribe idiots, but a wizard that keeps their newt skills up to scratch is pretty much carrying around a cornucopia machine in their pocket. Sure, you could spend a bunch of effort and rob a bank, then use that gold to have a house built.. Or, you know, save yourself the hassle and raise a cute little tower from the bones of the earth/bend space and live like a king in a post office box.. ect.
"Simplest; The goblins, and wizard society just do not approve of outright theft, even from muggles, and there are magics that will reliably mark stolen goods"
This makes a lot of sense. In a society where theft from even most wizards should be theoretically pretty easy, blanket 'anti-theft' measures seem most workable. Which, of course, implies that ownership is an intrinsic property of matter in the wizarding verse. Ayn Rand would squee.
Alternative; HPMOR is a sometimes a sideways critique of the Rowling universe, and should, perhaps, sometimes ...
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: