They are what you call Blu-rays now. And everybody other Company decided to join in.
Don't know if that's the reason why or not. But when you look at the back of every Sony BR case they have all of the 7 Country subtitles just like they had with Superbit.
Plus these were $29.99 when you could get a regular DVD for $19.99 or even when they were $9. Example of that would be The Fifth Element, and Snatch. Among others