StumbleUpon has been suggesting pages for me the last two weeks and the majority of them have been in error. They are either domain expired, or 404 pages. Are other people experiencing this?

I report those pages faithfully but I seem to get more error pages not less of them. Is it possible that SU uses people who report error pages, to cross check the error pages that other people have reported? I feel that the more I report error pages, the more error pages I see. Am I going crazy? Where is Nomad when you need him?