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My two cents - Errors generally only increase the value when that error was corrected in subsequent issues of that impression and when that impression is the first impression. This is more often than...

Game of Thrones being the exception :D

And a good part of that market growth is the quality of the series...

TV series don't generally push the value of books up, Films do...but usually that quickly drops down if the film gets forgotten... [that's oversimplifying by the way]