There's a ton of DC books that could use more exposure: Animal Man, Swamp Thing, Birds of Prey, Firestorm, etc.......
If this illuminati theory holds any water (which it doesn't, but whatever) it stands to reason that they would push someone who will guarantee dollars (Bat Fam) instead of pushing someone who "might" generate dollars (Animal Man). No exec anywhere ever has said, you know what, lets throw these real dollars off the table and focus on theoretical dollars.
Everyone who got a push in MvC3 is a combo sale, there's a big book coming up, or a movie, or a relaunch. For them, a cross promition is an add on sale, not a fishing expedition. They didn't throw Rocket Raccoon and Nova in there to "peak interest" they did it because they were already planning on shoving Guardians down our throats months in advance and they wanted to make sure everybody who bought said book had a reason to buy said game, and vice versa.
The books your talking about are just more back rack serials with uncertain futures. DC's not planning a Firestorm event next month or an Animal Man Movie. The amount of people who "might" pick up a Firestorm comic just because they saw Killer Frost in a video game is tiny and certainly not worth banking months of NRS' wages and WB marketing materials on on.