No, their utility is balanced by the research investment/cost in mage time/gem cost or whatever, especially if you want to wish (or other high level spell-spam.)
Can we keep the discussion to clams please. The balance of EA Rlyeh, although somewhat related to clams, is not the issue at hand. If EA Rlyeh is boosted overmuch by clams, and a clam nerf makes them useless, we can buff them in other areas.