Welcome to modern speculation on the hopes of a TV show. Just wait till it turns into Sixth Gun and watch the wheels fall off...
The $450 sale was the first one to the market. When a SS of the same book sells for $100 after an announcement I'm not too sure the wheels have even yet to be build. I feel like the announcement didn't really spike it. A few books sold since then at fair prices IMO for a killer series. Announcement or not I feel the quality and print run justifies an even higher selling point than now. Not because I own a few, I just feel it's several levels above most of the drek that's being released. I also feel as if many books that get optioned are really not taking off as in the past. May be speculation burn out, or because we hear so many announcements, or because the series optioned (many cases) was not a stellar series on paper. Who knows.
I do however feel that the release issues and the amount of stores that put 215 on the shelves also downplays it's worth but that's just me. I'm not familiar with Sixth Gun but hear it's an extremely well done series similar to what many say about Enormous. Show comes, awesome. If not, that's cool too because I love the premise of the story and Mehdi's work is top notch.