I wouldn't say aluminum are noisy. They clater like crazy if the rps sytem is loose, but you can use lock washers, or glue on broadheads, or even loc tite your inserts. That whole RPS thing goes back to the days when a dozen arrows didn't cost over a hundred bucks in certain cases. If you are spending a lot on arrows, then why not have broadhed arrows and target points? Stronger and less clatter. in certain cases carbon are more noisysince the ground surface can be noisy. You can deal with it, but it means that neither is perfect. Wood is great however, quietest by far, and very accurate, just not of much interest to most compound shooters, but they can be great. You have to buy good arrows in the first place however.