Well they obviously made more than their money back on it, and they explictly stated that they wouldn't produce any more simply because doing an intial run of ten thousand or whatever works out, but then having to do restock runs of 500-1000, etc... just makes no financial sense. And of course the models themselves are specifically designed for the game, they can be used for 40K, but you need to do some conversion work to be able to.
And of course when I asked them, both Jervis, Andy and Rick explicitly said that there would be no more copies made, and the models would not be made available seperately. And indeed one of them (probably either Rick or Jervis) told me all the stuff above, about production overheads and so on...
That being said, with the designs being 3D models sitting on a computer hard drive, I would be very, very surprised if at least some of the elements from them weren't to appear on the Blood Angels that are coming out in IIRC April... Indeed I'm half-tempted to kick my Space Hulk painting up a notch to be able to then use them as the basis of a 40K Blood Angels army in the Spring...