The new maps arent exclusive to Odst. They'll be made available as DLC for Halo 3 so those who buy Odst are being forced to buy the new maps whether they would use them or not.
The whole odst product is boosted by value added sales to justify the full price.
Its unusual considering Microsofts stance on console SKUs and their disapproval of Sony forcing their customers to buy things they dont need when buying a PS3. eg. hard drive, built in wireless etc.
You do get what you paid for but a lot of the crap in ODST I,ve already bought. And thats what I have the problem with.
[Edited on 06.13.2009 3:18 PM PDT]