Hobbits are lower I believe because it's hard to get close to what you paid out of a pricier title. Hobbits nib are 8-8.5k and so nobody would really gain buying a used one for 7500 or so. Plus, they're still available nib. Acdc hasn't gone down. Metallica is a dime a dozen and still in production, so availability lowers it's value. I'd say buy games based off wants, and not worrying too much about resale value.