[PaulHoule]

that's indirection and psychological warefare on the part of Google.

in the big picture you give them data and they process it as they wish; "nofollow" is just a suggestion. for instance, they can compute metrics of it such as the ratio of follow/nofollow links pointing to a site and feed it into their scoring system

good links do get passed around in comments (this is the blog post you really should read about this) that shouldn't be nofollowed, while other webmasters are stingy and nofollow everything they link. so who knows what Google or bing does with this.

What is clear is that if you play it safe and give no link, Google won't give them any credit.