Chainguide research leads to confusion

Wow, chainguides are EXPENSIVE! Here is the one E-13 am eyeballing:

The E-13 DRS Chain Retention System has been the leading dual ring compatible system since its introduction in 2001. Its simple to adjust and maintain flip-flop roller design gives unparalleled performance and reliability on the trail. This system is perfectly matched with the new breed [...]

Didja hear about the 100k Schwinn Stingray?

You can read about it and watch the vid HERE.
“Tom Mault of Hampton says the red Schwinn Sting-Ray that he bought for $350 on Tuesday has fetched offers as high as $100,000 from fans and collectors on the Internet.”
“Collectors decoded the serial number and determined that the bike was manufactured May 17, 1963 — one [...]