Seriously, it's the company's business how they do things. It's Sony's rule to ask for extra content, this isn't just in the case of ToV.
MS apparently (from a recent Valve interview, I believe) turns out to have a policy of no more than 1 free DLC. Up to them.
Whether it's ethical or we like it?
Well I don't like that MS paid for me not being able to get this on the PS3 for a year. They could have paid for a full exclusive too.
Profiting from others' research/development/achievement is nothing new.
Supposedly IBM's work on the 360 takes a lot from the research they did for the PS3 with Sony's money. Sony and MS are now getting into the whole motion controls to get their dip in the userbase Nintendo established. No doubt plenty of other occurances, but hey, we know everyone is in it for the money.
And in this particular case it's Namco wanting that money. Both when development started and they took the funding as well as now that they won't be shifting many more 360 versions of the game so why not have a PS3 one and sell again?










