Profit margin is an after-tax calculation.
You probably mean gross margin, but that's just a guess.
BD sells for about $10 more than DVD and costs about a couple dollars per disk to press. Yes, gross margins are higher.
Where sales are about the same and COGS is drastically lower. Gross margin is higher here.
But even now we have to add SG&A expense to the mix before we can get to operating income before tax. I have no idea which has a higher SG&A, but I'm sure it isn't cheap for either.
It isn't the size of the disk that counts, but how you use it.
4K cinema at 60mbps, coming soon to a kiosk near you.