Isn't the Poster Supposed to Make You Want to See the Movie?

This poster is for the movie Good Luck Chuck and gives us absolutely no clue what this movie is about. According to Wikipedia:

The story of the unlucky-in-love, Chuck, (Dane Cook) who breaks up with his longtime lady, and is then shocked when he hears she is engaged to her next boyfriend. He finds himself repeating this pattern, and is hopeful that single women will seek him out as a date, so they too will soon find Mr. Right. He then meets Cam Wexler (Jessica Alba), a lovable, but clumsy penguin trainer, who changes his outlook on love. However he finds himself in a pickle as she constantly tries to convince him to have sex and he doesn't want her to marry someone else.

LAME.

All I know is that this movie poster looks so fake that it annoys me. Do you think they actually posed together or they just photoshopped two pictures together?

They are supposed to be imitating this famous John Lennon/Yoko Ono Rolling Stone cover:
But considering the movie has nothing to do with Lennon/Ono, why spoof it? Otherwise, it just comes off as cheap and pointless. Hey, kinda like the movie!