You guys been keeping on eye on these lately?

They started out in the $10-$20 range but now are way out of control.

Nintendo Gamecube KIOSK DEMO! RARE July 2002
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=1381198683
ENDED: Sep-16-02 14:24:51 PDT
SOLD: BIN for $60.00

SEALED! Nintendo GameCube Demo Disc July
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=1380438953
ENDED: Sep-20-02 22:00:26 PDT
SOLD: $51.00 10 day auction

July Nintendo Gamecube retail demo! Very Rare
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=1379221839
ENDED: Sep-10-02 16:22:38 PDT
SOLD: $55.00 5 day auction

Rare! Nintendo GameCube Demo Disc June
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=1377728265
ENDED: Sep-07-02 20:13:08 PDT
SOLD: $58.00 7 day auction

These are now the worlds most expensive demos disks !!!