If the grading service is authenticating a coin, isn't it easier to authenticate when the variety is published? So why the extra fee?

So the grading service sees a double die and has to look in a reference book to compare. Isn't that their 'job'? Kinda what you hired them to do... authenticate the coin. How much easier to authenticate a coin is that; it's published? Yet it's gonna cost you an extra $7 at NGC, assuming they even bothered to update their reference library--or look at it. Must be that extra ink on the label... that's it ;-). Check out my 1869 Repunched Date, FS 8.5 er.... except it's just a Snow 10 RPD. Think it will cost me the $10 to "un-variety" plus this one?