Matthew-
Misconception? No.
For home and small business users using non-routable IP addresses behind a firewall, one extra IP address doesn't matter. For larger concerns (usually those with more expert staff), they can set that IP to a bogus/non-routable one or disable the web interface entirely (from both wireless & wired access) and use the serial (or usb etc) interface to set the device.
If your network wasn't IP based, why would you care if there was an IP address on a device?
Come on, no web interface on a Small Business/Home AP/Bridge/Switch is pretty cheesy.
Besides, I think you missed the main point of my post, which was to make Loren feel better about s-canning that thing since it didn't work anyway!
-Zeke