[QUOTE=Dj Yoshi]And you use it far less often. And it doesn't do jack for performance. Trying to compare buying a video card to buying a soundcard or speakers doesn't work. The latter are purely for enjoyment, and can be enjoyed equally well on a 500MHz Celeron as on the most beastly of systems. The former is purely for one thing and one thing only--frames (okay, I lied, and pretty effects).[/QUOTE]
And why do you want frames and pretty effects? For enjoyment. Why do you need high resolutions and graphic detail? For enjoyment. They look cool and provide atmosphere, which make the game more enjoyable. People invest in audio systems because they make their music sound better, which makes it more enjoyable. Music doesn't get old and boring like games either. Not unless you have a very small and very poor music collection. And if you're talking about people who don't listen to music often, um, well yeah, of course they wouldn't be investing in a sound system, the same way people who don't play games don't invest in gaming hardware...so that argument is moot.
You buy a video card so you can enjoy your games more. You buy audio equipment so you can enjoy your music, movies, and sometimes games more. So yes, you can compare them as investments. The sound equipment doesn't get old or wear out (at least not for 30-50 years), unlike other hardware which is obsolete within a year or two. And if you wish to continue enjoying your games with pretty graphics and smooth gameplay, you are forced to buy new hardware. Your audio rig won't sound any worse 20 years from now...
Bassoon, n. A brazen instrument into which a fool blows out his brains.