The internet abounds with scams to make you pay for information -- often information that you can get without paying for it. Freelance Work Exchange and GoFreelance.com are perfect examples of this: According to some things I have read online, many of the job ads on this paid membership site are simply reposted from Craigslist and other job boards, where you could have gotten the listings for free.
Here's another example. In doing some research for an article, I ran across an article with some information I wanted. Unfortunately, I had to pay in order to access the article. The prices were ridiculously high: from $9.95 (to access only the articles on my specific subject) all the way up to $99.95 (for a year of unrestricted access).
Following a hunch, I highlighted part of one of the excerpt's sentences and dragged it into my Google toolbar. And what do you know? The same exact article is available, for free, from another site.
I can't help but wonder what exactly is going on here. One of the two sites might be infringing on the other's copyrights. Or they might be run by the same company, on that is betting on people being lazy enough to just go ahead and pay their fees on the membership site...while making money off of the ads on the free site. Either way, it's a disgusting scam.
The moral of the story? Do your research, and beware of any site charging you money to access the same materials you can find elsewhere for free.