I dont think it will affect sales but to me personally and a lot of my friends who are PS360 owners and anime fans, it is a another clear reason to not even bother with the 360 version.
Once you go with subs on a anime or foreign films you cannot stand a dub version, it is specially painfull watching something dubed you already watched subed, they just butcher the content not to mention the soul of the characters get changed for the worst, deathnote in inglish is just painfull to watch, anyone arguing that subs are not needed should try watching something sub first ( the original way it was supposed to be viewed ) then watch it after with dubs, you will see a huge difference.
Systems owned: NES, SNES, N64, PS1, PS2, PS3, Wii, Xbox360
Currently Playing: UNCHARTED 2 !!
Waiting for: FFXIII, GoW3, GT5, Mass Effect 2
