Perhaps all of the Ainur used up their power in their actions(not all of their actions, things like making the two trees, enchanting Vingilot, altering their forms), the difference being that the Valar and loyal Maiar had the support of the permanent power source(Eru), whereas Melkor had to use up his own large but limited supply of power.
This is a theory with holes in it, I'll have to admit. After all, Yavanna only had enough power to make one set of Two Trees. [img]smilies/frown.gif[/img]
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