Actually, I've heard people saying that CRT screens were better than LCD when it came to colors. A couple of problems that LCD monitors might have:
- low viewing angle
- color shifting if they're using a TN or MVA/PVA panel [1]
- loss of dark details for MVA/PVA panels [2]
- 6 bits per color channel like the pretty recent Dell U2412M monitor for example [3]
Sure if you're using a good (and expensive) monitor like Dell U2410 (comes precalibrated) or HP LP2475w you won't have these problems, but not everyone has them. Let's also not forget laptops which have crappy displays most of the time.
[1] http://lcdtech.no-ip.info/en/tests/color-shift.htm
[2] http://hardforum.com/showpost.php?p=1034585910&%3bpos...
[3] http://www.tftcentral.co.uk/reviews/dell_u2412m.htm