I don't think Metallica sold out when they cut their hair. I mean, come on, it's just hair. However, I realized Metallica sold out the day I first saw them in an ad for ArtistDirect.com. This suit takes them down several more notches on the coolness ladder IMO. While I don't like his music, Chuck D's opinions are way cooler. I mean, of all the bands to be bitching... Metallica is probably one of the richest bands around. They need more money? Grr.
I currently own Ride The Lightning, Master Of Puppets, ...And Justice For All, and Metallica (aka the Black Album). I own all of these because I heard a couple of songs on them on MP3 first. I heard "For Whom The Bell Tolls," and said, damn, I need that album! And I was pleasantly rewarded with a great album. Same story with the rest of them (well, maybe not Justice... but I still like it). If not for these illegal MP3s, Metallica wouldn't have my money today. So who is the real winner with MP3? Metallica gets money and I get albums I know I like. If not for MP3, Metallica and I would probably never have crossed paths.
Some people will never learn, I suppose.