Catalog Prices

Shouldn't catalog prices by all artists be priced below $8. I use that price because that seems to be the average price for used CD's in good condition. I was thinking about this because BMG/Sony recently reduced prices on a ton of catalog. But the choices of which ones get priced below $8 and which ones are still priced above make little sense. Sure, you can see what they're trying to do. Lesser known titles get priced low and continued sellers are still above-budget price. But why? In 2008, shouldn't Billy Joel titles like 52nd Street be priced the same as Storm Front? Record companies don't understand. If someone wanted the former they would go to a used CD store or website and find it cheaper than the company price anyway. So why not keep all catalog prices where consumers are buying them anyway.