AHHH! I found something!
http://pages.ebay.com/help/policies/teachersedition.html
I'm thinking they mean public school teacher's manuals and homeschoolers are possibly being snagged by them, maybe automatically?
Well, that just tells me that I need to label it "Parent's Manual" and make sure the "teacher's edition" words are covered. As a matter of fact, that's what the auction I won called it! Parent's guide!!!
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320001028227
I'm going to post mine here in a bit.
Clevahh! I'll have to pass that along to my Classical Ed. group.