Rachelle Gardner has a great post up on her blog about why authors (as a group) need agents (as a group):
" You, as an individual author, may or may not require the services of an individual agent. But whether or not you realize it, whenever you deal with a publisher, you're benefitting from the collective work of agents over the years.
For the last few decades, agents have been on the front lines when it comes to advocating for authors in their relationships with publishers. It's interesting to speculate on the state of publishing contracts if agents had never been involved and authors had to fend for themselves or just take whatever the publisher was offering. ..."
Reach Rachelle's entire post here.