Cost per GB is irrelevant because it is pretty much industry standard to release a movie or game on a single disc or multiples. Discs cannot be sold as fractions. As well, producers don't save any money for not using the whole disc. So until BR becomes a cost effective and popular form of storage for the masses, a cost per GB analysis is irrelevant.
Since it costs the same to release a half full disc as a full one, it would be much more relevant to compare the cost to produce the most popular of each disc size, a 25GB BR to a 30GB HD-DVD. It is cheaper to produce a single HD-DVD (30GB)and it is also cheaper per GB. Since development costs are likely over $10 per disc, the costs of production are very unlikely to sway a studio one way or another.







