Why is Rockband More Expensive on the 360 than on the PS3?

[Saiyar]

javierdacosta said:
you only own a PS3 so yes you will get the PS3 version, on my case I'll get the 360 version, lot of download content I imagine. HAHAHAHAHAH

The PS3 can potentially get more DLC than the 360 since I doubt Sonymusic will be in a hurry to liscense any of their songs for XBL.