I've always had issues with people who have hazy job descriptions. To me, managers fall into that category.
We have 120 clients at my agency and I'd say that about half of them have managers. I would also say that a small percentage of those managers actually contribute a great deal and earn their commission. As for the others? I have no idea what they do. There's one guy in particular who hasn't spoken to me in three months! For all I know, he could be dead.
I guess it's like everything - there are good managers and there are bad managers. The trick is in telling the difference.
Managers can be helpful at two points in your career:
1) When you're just starting out and you're in desperate need of guidance. Agents won't talk to you, you can't find the right class, everyone hates your headshots - this is the time when a good manager can help you get it together. And then when the time is right, that manager should be able to introduce you to agents.
2) The other time is when you actually have something to manage. Consider the character of Vince on "Entourage". Scripts are coming in, offers need to be considered, pr has to be over seen - that's when an experienced manager can make a huge difference.
Here's my advice and I want all of you to let me know if this helps. When you're thinking of signing with a manager, you MUST get answers to the following questions:
1) What is the manager's background? In other words, how is that manager qualified to manage your career.
2) How many clients does he have and who are they?
3) Which agencies does he do business with. That's a big one, folks. Very important to know.
And finally, don't sign a management contract without having someone check it out. My friend Tony Martinez wrote a book called AN AGENT TELLS ALL that has an entire chapter on this stuff. You should definitely check it out.