I've been looking at coaching options lately, and a lot if seems to be just paying to be lazy. Paying for fairly premade training plans and a weekly email to talk about it, while all the information is out there to understand how to build you own (training with power, the advanced cyclist, the training bible, etc). If you really can't sit down and read these and understand them, then pay $100/month for someone to explain it to you.
This is not to say coaches do not know anything outside of a book, but if all you paying for is the basic "make me a training plan", I think you are better off figuring that one out on your own.
That said, I have been RIDING with a coach lately. Think of a group ride but with him riding along side and giving feedback and organizing. This is awesome. He helped with my position and its great having someone giving immediate direct feedback. He even joined a gran fondo with us and helped organize attacks and stuff, it was a lot of fun. We do this at the track as well. I would sooner recommend attending a week long bootcamp with a coach than buying some weekly email training plan.