They are not cheap for 10 models when you can get 10 equivalent models for 2/3rds the price. Whether or not you can do that without losing miracle dice is irrelevant -- these guys are very expensive if you aren't loading them out for melee, for what they do.
What matters is how they compare within the codex itself, and I still say they do so favorably. Not necessarily an autopick over more BSS (at least for non-BR), but then they shouldn't be. They are, however, a very viable pick. Why the hell do people want everything new to be balls-to-the-walls overpowered or they're useless? And then in the next breath they blame GW for trying to push new models with OP rules... 
For that matter if you want to compare cross-codex... a regular Guard Infantry Squad for Guard is 55 points, but have a 5+ save, no invulnerability save (ours may be army-wide, but it still factors in the overall cost), worse BS by 1, worse leadership by 1. A veteran squad would be closer in stats, though still the worse saves, and they're 65 points and not troops.
And even mentioning grots, for crying out loud - are you trying to kill your credibility or what? They're cheaper sure, but also entirely useless even for 5 pts each. Novitiates are Primarchs by comparison.