even if those games didn't earn profit, you are still fostering new generation to be your lifelong customers. new generation grows up everyday.More LBP, More Astrobot, more Ratchet, more Sly, more Jak.
They can definitely organise to have studios make these games so there is 1 of these franchises every year. 1million+ sales in fine for titles like this
Playstation's strength used to be variety, that's why, they were top choice.