It is interesting to watch the phenomenon.
Step 1: Films is underdog. GAF supports it and hopes it is good.
Step 2: Film turns out to be good. GAF cheers and celebrates.
Step 3: Huge box office hit. GAF jeers at films it beats.
Step 4: GAF realizes it is popular now and that offends their hipster tendencies.
Step 5: Film is now overrated and X, Y, and X indie film is sooo much better.
If by GAF you mean the majority of posters, then "Step 1" did not happen.