Within Geeklist auctions, those sorts of things are generally fine, after all it's another chance at commissions for BGG. I've seen people put up books, video games, and movies without complaint. It might be polite to put them at the bottom of the list, out of the way of the game hunters who most frequent the auctions here.
I second this fully. I have bid on items I otherwise didn't even know existed and would have never bought but for the combined shipping. Putting them at the bottom of the list helps a lot.