SO4 wasn't announced before the wii launched, neither was infinite undiscovery, or tales of Vesperia.
If money was the absolute sole motivation then then all development would shift to the DS, or hell it never would've left the PS2. Why make anything for the wii, 360, or PS3 when there are over 120 million dedicated PS2 fans out there? Because developers also want to make grandiose games, they want their vision to be realized, and they want to push the boundries of available technology. Just like with all mediums of art that also make a profit, there are artists behind the suits that can say what they do and don't want to do.
By your 100% profitibility theory no new systems should exist, and the PS3 and 360 should've died long long ago.

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