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Because the bb86/90 or whatever standard doesn't have tight enough tolerances for them to make them out of metal?
Howard-
Pretty much.
You can see their logic though, it only takes something to go minorly wrong taking a bb30 out and you're not in a good place, the metal on the carbon means that if something has to give it'll be the latter. The vinyl/plastic cups give a bigger margin for error, interestingly though Trek's bb90 seems to have a much better reputation against creaking.
noBlakes
There's a reason why Shimano make all of their pressfit cups out of plastic