I belive the only way someone should remove their advertising is if the link:
a. has a forum concerning Husker Athletics
b. poses a signaficant threat to take away users from us
If it's a first post advertising thing, the first thing to do would be to PM/Email them because you never know if it's someone trying to start something up with some Husker fans for fun or just a spammer. That way there are no misunderstandings.
I see it this way because, I have started a blog. If I wanted to put the link to my blog in my sig or post a new topic asking people to check it out, I should be able to because I'm not trying to take away people from HB, I'm merely trying to garner interest to my site.