of course they have, why else do you think they only want 2.5 million sales, they already calculated what they needed to have a nice profit, to be able to make another one, plus don't forget the dlc and the drake comics, that will bring in money.
it's the future of handheld
PS VITA = LIFE
The official Vita thread http://gamrconnect.vgchartz.com/thread.php?id=130023&page=1