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Short answer...$$$$$$. Having an aluminum oil pan and or valve cover might cost a bit more than the OEM plastic ones, that cost differential is still significant no matter how small when you multiply it out the hundreds of thousands of engines.
ETA: I've been lucky so far with my N55 equipped E82. So far no leaks from the valve cover or oil pan with 102,000 miles on the clock. I did get hit by the OFHG.
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