Hollywood marketing departments aren't that creative, so how else to sell an ensemble pic? With a bunch of smiling stars smooshed on a poster, especially in a cute shape. The only one who appears on all three? Bradley Cooper!
As an eagle-eyed tipster points out, this must somehow be his fault. After all, out of the galaxy of stars, he is the only one who chose He's Not That Into You, New York, I Love You, and Valentine's Day and his is the only face that is on all three of these remarkable identical movie posters. Maybe his agent set it up? Maybe he writes being in a rogue's gallery poster into his contract? Do you think that the poster for The A-Team is going to be a picture of him and the rest of the crew in the shape of an A? Or maybe they'll do us all a favor and just show us a close up of his abs.