Agreed, poorly phrased by me. Perhaps "shouldn't be worth much more than other comics from that title with close release dates."
I certainly understand supply and demand for comics, and yes, it's worth what people will pay. And I understand that comics that have appearances of certain characters are the ones people want. That will tweak the price up a little, like Star Wars 81.
I'm simply putting it out there that the (IN COMICS) part gets forgotten in the phrase FIRST APPEARANCE (IN COMICS). These First Appearances seem to have a Barry Bonds record-breaking home run asterisk in my mind. (Then again, that ball sold for $750,000, so that doesn't help my argument.)
It simply seems like, since comic collectors can't get their hands on a 70mm print of ESB, we overhype the first appearance in our preferred medium.
Here, let me ask a less contentious question. Would something like ASM #361 be worth as much as it is now is the character first appeared in a Spider-Man cartoon? Would Batman Adventures 12 be worth more if she'd never shown up in B:TAS?