That's the rub. I like bad big-budget movie riffs too, but it's hard to convince anyone to spend $15+ on a bad big-budget DVD/Blu-ray. I doubt Battleship will find its way into many homes, and there wouldn't be many willing to go out and buy the movie just for the sake of the Rifftrax (Even though I'd be one of them). Our only hope, then, is for a Bad, Big-Budget movie that everyone THINKS is good and worth buying. Hence, Twilight.
I do have a Blu-ray of GI Joe, for the record. Just in case. :^)