Are devils worth 7 blood each?

[Arryn]

Huzurdaddi said:
Unless someone is playing Atlantis or is astonishingly competent clams don't really come into the picture until turn 60 or so.

I guess I must be "astonishingly" competent because, in my Caelum SP game (Orania, 15 nations) at turn 42 my astral site income is 1/turn and 21/turn from clams. I'd say that a 21:1 clam income ratio is by most anyone's definition "in the picture". The clams (and astral gems) do not change my strategy at all (I could live without any whatsoever), but they are sure handy to have for alchemy, which speeds some of my summonings or forgings by several turns. Oh, and I haven't been diligent in site searching, either. I'd have more clams (from more water gem income) had I been deliberately seeking to maximize my output of clams. As it is, I've just been using the water income I've come across through conquest.