I think Batman is just perceived as the PS3 Slim 'Launch Title' so to speak. Alot of new adopters are getting the console with this Batman game, mainly cause it's got alot of hype behind it and some shops are bundling them together.
They seem to be marketing it as a PS3 game too, with the exclusive DLC and whatnot, maybe all those games with exclsive 360 ads and DLC are benefitting alot more then we thought? Maybe it is hurting PS3 sales...
The main thing for me though is that not even 50% of Xbox's have live (might be higher now?) and I'd imagine PS3 online ratio is similiar. The fact is the mass gaming market don't even know this exclusive DLC exsists so I don't personally think it can impact sales significiently.











