GhiostMatter: Let me preface this by saying that I would love to charge more money wherever possible.
That said, I'm not sure how we could make a digital collector's edition since most of the value is in the physical goods.
Well, if you look at Mass Effect 2 Collector's, which I bought on Impulse, I still got the artwork book, comic (both in PDF), documentary and soundtrack (and in-game bonuses). Else, I would've gotten the box as I wanted the artwork and documentary.
So the Digital Limited Edition could contain:
18x26” viewable and/or printable Elemental Poster
Extended manual with additional information on the world of Elemental (i.e. 200+ pages)
Elemental extended musical soundtrack
18x26” viewable and/or printable map of the world of Elemental
Price: $60 or 65$
It's just an idea. I'll be getting the physical loot, if only for the dragon which should fit right along my comics figurine collection.