<< I don't see it as a large problem so long as he can stop the sale on half.com should he find a buyer here. If there is a question as to whether he can guarantee that or not, I'd vote for an immediate lock. It's not worth the trouble it would cause. >>
Is that the reason that eBay links aren't allowed, because the auction can't be stopped? I thought eBay auctions weren't allowed because they went against the auction clause. You can stop eBay auctions but that requires you to cancel all existing bids and give a reason (one of them being "item is no longer available").
My knee-jerk reaction is to say that half.com auctions should be allowed since there's a definitive asking price that's first come, first served. But I don't like the entire self promotion scheme on the forums though, like you find eBay links in newsgroups and on mailing lists.