Skeet, I know the rules and also the way they are enforced. These are not classified ads, they are offers among (hopefully) regular members for sale or trade. My comments did not suggest posting without an actual offer to sale in $ is to be encouraged. The rules AND guidelines suggest and encourage an "asking price" but I am unaware of any post that has been removed for violation of this rule or guideline.
If a moderator had posted a request for asking price and cited the "rule," I would not have objected or sniped. Yet, if the Prof is a "buddy," wouldn't it have been more prudent to PM or email fadeaway with a suggestion that he comply?
So that's all I will offer to justify my comments.