groucho69
Headphoneus Supremus
3 different colors so that assembly is easier. You know which wire is which. If you have all the same color wire, you've got to follow the lengths all the way down the wire which takes time, and time is money. If you've ever built or looked inside a computer, power supplies generally have multicolored wires. This is done for the same reason, and the colors are actually standardized now. You generally only find all-black cables on more expensive power supplies because as stated before, it takes more assembly and QC time. And time = money.
Absolutely. Imagine running cables to hook up your speakers through your walls that is uncoded.