Have you noticed the spammers trying to bump old threads?
I've been getting post updates to some of my really old threads that are well crafted but still blatantly spam. (Are they hiring stay-at-homers or college kids to spam boards with almost relevant posts?)
It's a common practice among spammers to do this on PHPBB type sites (like the main Woot forums) as it bumps the old thread to the top of the list.
That approach fails miserably on deals so I don't even bother tattling as nobody will see it.