In reply
I'd say recognition and vanity. Sauron's probably very eager to show off his power, so making his most insignificant minions very recognizable might be a show of it.
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Three rings for the Elven-kings munchin' on rye, Seven for the Dwarf-lords in their nightly drinks alone, nine for Mortal "Men" doomed to cry, one for the Barrel lord on his barrel-y throne in the land of hoarders where the fellows cry.
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