Grestest Hits albums are the biggest mockery of the music industry.

[NM]

U2 have had a couple and they're still around for some reason

U2's Best Of 1980 - 1990, came out around 1999. At that time U2 had been around for nearly 20 years. U2 have survived for so long because they've constantly changed there sound. Listen to Boy(1980), and then go listen to Pop(1997). You'd think you were listening to a completly different band.

After that many years you need to attrack younger people to your fan base, and a Best of Album's a decent way to do that. Rather then expecting someone to go out and buy 6 seperate albums.