eBay reps are an exercise in frustration. I have never seen a bunch of people who, as a group, seem to have the same brain-deficiency.
Having said this, while I fully understand your frustration, and my tone with eBay's reps has not been any nicer, the preamble in your listing gives them now a valid reason to pull it. I took that approach once, and mine was pulled. Their reason was that the item description is supposed to contain just that. I was quoted the following from the User Agreement:
Listing and Selling.
5.1 Listing Description. You must be legally able to sell the item(s) you list for sale on the Site. You must describe your item and all terms of sale on the listing page of the Site