In the case of dawg's offer, I don't think that one link isn't going to matter to much.
But this is the garbage that Google is doing that you need to worry about who links to you. What ever happened to quality of content and do what will benefit your readers.
So, the end result is that you could have the best content in the world and a lousy link profile. You aren't going to rank for scheiße (pardon my french)