One thing to remember about the studio, though, is that Summit is a relatively new company. They don't seem to know all the rules of distribution yet (they released a slasher film on 9/11, which probably wasn't a very good idea), so they may not know how to produce hits for the time being (of course, no one really "knows" that anyway).In fact, looking at the studio's brief history, their own successes are Twilight and the Nicholas Cage sci-fi flick Knowing from earlier this year. Everything else they have had a hand in distributing has either bombed or drastically under-performed. All because of lack of marketing.
As for lack of marketing, I don't think that's really an issue. In the case of "Astro Boy," they made a trailer for it last year, and I've seen a good ammount of promotion since then (including ads during the World Series). In the case of another release, "Bandslam," I saw a ton of commercials for it, but it still bombed.
If they market "Twilight" to death, you have to admit it's understandable from their perspective. The franchise is their bread and butter right now, and if it doesn't deliver for them, then what will?