Print runs man. There's like half a million copies of X-Force #2 compared to 50K or so of GOTG #1, and it's the 1st appearance of the current team. You know, the one the movie is based on
But even with a 50,000 print run there is still a huge supply of them in high grade. There aren't 50,000 buyers out there clamoring for a copy. There are a couple of hundred speculators/hoarders trying to flip it.
I'll buy the print run argument for a book like Walking Dead 1 where the demand might really exceed the total run. For most other books, the supply is still pretty big. GOTG 1 isn't a 1st or close to a 1st for any of those characters (is it a 2nd Groot? I admit I don't know). I guess you could try to argue this is the modern equivalent of Defenders 1, but I don't think it's anything more than temporary movie hype. That GOTG book had its fans, but was and is a near nonentity in the Marvel Universe.
Avengers #1 isn't the first appearance of any of those characters... Don't you think a big blockbuster movie could make the GOTG an entity in the Marvel Universe
I find it hard to believe. But then again when I saw the GOTG trailer, I thought "Good lord, this is the end of Marvel. This is going to make people pine for Battlefield Earth." And then people started acting like it actually looked good so, hey, anything's possible.
But even if it's a hit, I don't really think a movie makes for much of a change in the comic book world. Blade was a hit franchise and... nada. He was never going to have much to do with the broader Marvel Universe. GOTG seem like they are best suited to stick to their own little corner - they wouldn't work if they got spread out through half the titles like the Avengers.