Does it ever occur to people who post these links that immediately, upon posting these links, that it is very likely they will cease to be 'a good find' or 'a good deal'?
As far as I've been able to tell, many of the people really looking for a good deal already know about these auctions, so posting them is more likely to foil those activities than aid them.
I'm not saying you can't post these things, I'm just saying that it may do more harm than help to those who are really trying to obtain them.