I think in this case, the hype doesnt have to neccecarily come from tv shows/movie deals. I think that one of the things that we all love about saga, is its a comic book made specifically for fans of comic books. (The references to D. Oswald heighst's work influencing alana profoundly, the inside "writers" jokes, the epic space opera on nearly the same scope as star wars.) This is a comic for comic fans. And I think that sales have reflected that. With no tv show, movie, or cartoon to hype the book, and In todays market, 70,000 issues sold is nothing to scoff at. Some of us "obsessives" are buying them for collcection and investment, but alot of people are reading these, and connecting with them.
Walking dead issues were still relatively cheap before AMC announced the tv show, and now kirkmans licensing the series to everything from cars to clothes, to action figures. So naturally there would be a collector market for individual issues.
But saga built this hype on its own. And it really built after the first few issues were released and people saw what we were working with here. Does anybody else remember a series that was fetching these kind of prices for a slabbed 9.8 first issue only 12 months after it came out? I personally dont. And coupled with the amazing story and acessable art, I think saga is in for the long haul. Whether it gets syndicatedto tv or made into a movie.
And on that note, Y the last man was recently optioned for a movie, with vaughan basically playing no part in that. Once Y blows up in the theaters (lets face it, no matter who makes it, its a much more original premise than the that hollywood recycles into movies) brian vaughan's going to wonder if he could do e same thing himself, with a story he owns the entire rights to. So far, the only work he outright owns, is saga.