Maybe, another reason, was that they placed forth their power to do evil deeds... but because of what Eru said (that their evil deeds would turn out in benefit for the creation and for good) even though they tried to do evil, in the end it turned good...
Im seeing it like their effectiveness with their power reduced when they used it for evil purposes, since the results they were searching for were not achieved.
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"In place of a Dark Lord you will have a Queen! Not dark but beatiful and terrible as the Dawn! Treacherous as the sea! Stronger than the foundations of the Earth! All shall love me and despair!"
--- Galadriel when tempted by the One Ring.
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