Here is 1 example of more data does not mean better:
30 X 40 =1200
Same result and I would hope most here agree that the top equation is what we strive for.
I don't see how, if the result has the potential to be the same (which so far more data and higher bitrates hasn't proven otherwise) why we would want more data just for bragging rights.
Paidgeek is correct in one aspect only: Blu Ray has more room for mistake(s) than HD DVD for PQ/AQ.