I would be surprised if a double-digit percentage of potential buyers regularly played blu-rays on their windows HTPC. It's an irrelevant feature for a high-end gaming case because of how much better a walmart blu-ray player is in comparison. Who with this kind of money will settle for such a terrible blu-ray player as powerdvd?
I use ArcSoft TotalMedia Theatre 6 which I grabbed off of Newegg for $30 on sale, easy to use interface and it just works. I would definitely want an optical slot on this case for a blu ray player.