And how much "advice" to they give? When I went, the only time you had to talk to your advisor, was once a semester for them to rubber stamp your approval for major-only classes (which the official advisors would defer to in-major professors). Beyond that, you were free to talk to advisors on an as needed basis. There role was essentially to be a primary point of contact for students. Why shouldn't a student have multiple advisors. If she has a problem/question with her honors program, ask the honors advisor. If she has a general administrative question, go to the general advisor.

Our entire math department was served by two advisors who likely also had non advising administrative duties.

My honors advisors were just the main faculty of my honors program.

I don't think I ever spoke to my official CS advisor.

I found my CS advisor repeatedly very helpful. I would not have graduated in four years without her advice.

So, just because you didn't get value out of it doesn't mean that's true for all students.

As a professor who is also a major advisor, I cost nothing, because I'm not paid separately to advise. On the other hand, given the corresponding emphasis on training and evaluation of advising (not much, although our department and college are working to get better at it), my advising is probably worth about what I'm paid for it.