To what end?

I'm always looking for the "why?".  Motivation fascinates me - particularly when it's not obvious.  So what about these recent computer hacks - particularly those affecting PlayStation and Xbox.  Where's the pay-off for the hackers?  Who are their real targets?  Surely not the unfortunate kids who have not been able to use their Christmas present games consoles?  Or are they just collateral damage in a war between the anarchist hackers and Microsoft and Sony?  Or perhaps most worrying and terrifying is that maybe this is just a case of "I'm doing this simply because I can, and I don't care who gets hurt in the process".  So - principled, unprincipled or merely amoral?  I don't know.