You have to view it from a historical, rather than a financial point of view. For example, let's say someone created a fake that was so good that someone paid big bucks for it. Congratulations to the crook: he just scammed someone out of some money.
On the other hand, there's those of us who have an interest in ashcans not primarily due to their monetary value, but because of their history. I mean, a real ashcan was probably literally in the hands of the book's creator(s) before the series even began. They're truly a piece of comic history.
If someone recreates a Picasso so well that it fools the experts, does that make it a Picasso? NO
As to what I have:
Animal Antics
Cyclone Comics
Intimate Confessions
Real Fact Comics
Movie Cartoons
Movie Fables
Movie Gems
Screen Cartoons
Screen Comics
Screen Fables
Screen Funnies
Screen Gems