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from what I have read you do run them with grease or oil in them so they do have some lube, but they reason they can run dry is that steel "sticks" to steel, this is part of why using bronze or brass as a bushing works, but their draw back is brass is soft, ceramic is extreamly hard, so even if you put it in steel races it will not stick to them causing that initial friction and wear that you need oil for.
mcmaster carr sell the plane balls that could be used in a bike, $3.55 each for 3/16" and I think a bike needs around 26 per wheel?
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