It is worth a dime though. I guarantee that seeing "overclocked" plastered on a box gets noobs excited. It makes that edition of the card seem better than the stock-clock version. And so the overclocked version potentially becomes more "valuable" to them.
Now, if it's the overclocker edition, that's different. Unless it's just some non-english-speaker getting confused with the wording. I'd still be suspicious about whether or not the company actually made the product more expensive to build, in an effort to create some extra quality, though. That's not the goal of the companies selling these cards.
Besides you're not expecting RV790 to go much higher than 1GHz are ya?