I think the thinking is that they would rather devote that disc space to something, in their minds, more worthwhile. Because it is true, the more you add, the lesser the quality will be. They may also think that people will buy the BD, take a look at the other options, and think "the hell, I paid to have this new blu-ray and it sounds like crap!" That's the problem with technology when it becomes mainstream. Remember "full screen" DVDs? Jesus Christ. The sad fact is that your average viewer watches Blu-ray but your average viewer isn't really informed enough; on top of it, they have just become accustomed to noisless, multi-channel mixes, and anything less is junk to them. The people in the board room making these decisions are, without hyperbole, probably many such people. They are just businessmen (and women) after all, not film fans.