They probably have a deal with Sony to keep it exclusive to PS3+Vita. Not a big deal, I'd doubt it would find much success on 360 anyway.
|1||BlazBlue: Calamity Trigger||PS3||2009||Fighting||PQube||0.35||0.08||0.06||0.05||0.54|
|2||BlazBlue: Continuum Shift||PS3||2010||Fighting||PQube||0.18||0.06||0.09||0.03||0.36|
|3||BlazBlue: Calamity Trigger||X360||2009||Fighting||PQube||0.20||0.08||0.04||0.03||0.34|
|4||BlazBlue: Continuum Shift||X360||2010||Fighting||PQube||0.21||0.03||0.02||0.02||0.28|
Sales aren't that far behind the PS3 versions.