This one cost me around $26 shipped, 2 others bid on it. They are HEAVY.
To be honest I wasn't sure it would arrive in one piece, and after opening the huge box it came in to find just a couple layers of bubblewrap and 70% air on the box I figured the only thing that saved it was the base was so heavy the shippers couldn't turn it upside down and trash it.
I never really liked the original SDR based G4 Imacs (a reseller had one ages ago as his main machine and I used it a bit). But since this is DDR, has a cooling fan, G wireless, can do 2GB of RAM and has a useful 1680x1050 screen I figured I would give it a shot. Having a few iMac G5's made me tolerate the all in one design more.
Mostly I get bored and want to try something different, and the price was cheap enough that if I didn't like it I could ditch it easy enough with no loss.
G4's are starting to cost a few bucks so they won't be getting any cheaper.