Anthologies Question

Conventional wisdom says that comic book anthologies don't sell very well. I've heard this from any number of sources, including retailers and publishers. But it occurs to me that I've never actually seen numbers to prove/disprove that notion. In fact, if that were true, wouldn't Heavy Metal have gone the way of the dodo? It's been running with some measure of success since 1974. I also understand Kazu Kibuishi's Flight series of books have sold well. And how about Dark Horse's online venture on MySpace? Didn't that warrant a TPB collection?

So does anyone have proof that comic anthologies, as a rule, don't sell? I understand that, if retailers and publishers believe that, it becomes a sort of self-fulfilling prophecy, but is that actually based on hard evidence?

Anyone have anything concrete on this subject?

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