Because producers and studio executives don't have imagination or any understanding of why audiences like the things they like. They're only going after Real Genius because they've likely done surveys and figured out that people recognize it.Eh?
This wasn't a movie that was fun because of the premise, but because of the cast. How do they not get that?
Expect a lot of space movies with wacky CG characters purely because Guardians of the Galaxy did well.