I was there at one time where I wanted an overwhelming amount of bass in everything because it sounded cool, and if you could get a system that didn't distort bass sounds, it was a sign of "power" (I guess)
Honestly, a sub is cool, but I sometimes think subwoofers outside of cinematic audio is a waste of space. Seriously, I'm actually more content with the pure bass sound that comes through my headset than the massive 8" sub on my Logitech Z-2300's. The bass on the Z-23's is amazingly clear and doesn't ever distort at any level, but my headset (creative fatality headset) reproduces the lows more accurately.
Subs are cool, but now that I've been there and done that, I think they're overrated. I've actually thought about ditching these speakers for a nice set of reference speakers that sit by my monitor.