Check this out.... site:sixnix (dot) com 140,000 scrapper pages indexed at Google. I have been watching this one... Yesterday, they has 240,000 pages indexed. I remember this site because I had to ban them in my .htaccess for referrer spam. This was in mid-December. I am hoping that Google is making this one disappear. I also found a few other sites from my banned list that had 25-50K pages indexed with nothing but the same.
Also, not everyone can make it a link - a person needs to have a certain number of posts, so newbies may not be able to do so.
Besides it eats up a lot of bandwidth from your server, what damage does it cause you? I've seen many sites like this as well. From what I can tell, these sites seem rather harmless as they never rank well in any SE. No?