Triple Play? Schmipple Play!

[tux1977]

If Blu-Ray is so great and far more superior to DVD, then why is it distributors are releasing Triple-Play sets? I can understand making a digital copy available to allow you to watch it on your smartphone or iPod, but why have the movie on DVD - surely if you've bought a Blu-Ray disc, it implies you've got a Blu-Ray player and as such negates the requirement for a DVD??

That said, I might be wrong, but I get the feeling that certain Triple-Play (and possibly Double-Play) Blu-Ray releases don't have an equivalent DVD-only release? Perhaps a cunning ploy to shift more Blu-Ray discs??