From what I've seen, the problem with agencies is that you might have 100 people competing for the same position. Your chances of standing out, no matter how good you are, are slim.

There is at least one agency out there that has tough, tough requirements, and a long testing and application process, for what amounts to $10 an hour. But they do all the marketing, and actually seek work for you. They don't guarantee anything, but once you're in, you don't have to market yourself on their site.

Other sites, you are bidding and competing, and the only way to get work is to bottom-out and undercut everyone. Which ultimately hurts you even more, when you're stuck with a $5 an hour contract!

Take the advice you've been given, and work on a website. Ultimately, you'll be thankful you did!