Links may be the currency, but domain names are the gold backing the currency. This works because domains actually cost something.

I don’t get this at all. If registering and maintaining a domain name cost nothing, links would be worthless? Consider further: if people didn’t care about familiar-looking or short domain names, 100% of the price a domain would fetch would be due to the links pointing at the domain.

(Regarding the subject of the post, I agree that Attributor is approximately 100% a good thing.)