Domain names are not a scarce resource, there's no need to put the bar so high. As far as I can tell the current system with the current pricing seems to work just fine, why not continue that way?
They are, though, since each domain can only point to one server (per RR type). Or at least meaningful ones are, but if you're okay with a random meaningless string of characters rather than something memorable then it doesn't really matter whether it's under any particular TLD. Moreover, when it comes to .org domains the money you're paying for registration is supposed to cover some background checks to verify that the buyer is really a non-profit organization and not some scammer, to maintain the reputation and integrity of the .org TLD. That takes labor, and labor is a scarce resource.
