@EyeHawk No thanks. I understand economics. Morality also has a page on Wikipedia if you're interested.
jchamplain - I bet you haven't read either entry yourself friend :)
That's a whole different can of worms, but in a nutshell morality is NOT black and white - which is essentially what you're trying to imply here.
On the same vein by extrapolation your argument essentially is that all business is bad, since somewhere someone is being exploited. Perhaps you live in some kind idealist virtual commune, but those of us in the real world need money to live, and fuel our creative passions.
Here's another tidbit to think about: Whenever you start something new, e.g. a new profession, business, etc, ironically it is not all about the money, i.e. sometimes you need to do things for non-financial gains such as noteriety, goodwill, experience etc...
Those non-financial rewards will essentially lead to financial ones. So as a start-up company/artist/developer you can't afford to say "I'm getting shafted" just because you're not getting paid as much as Bioware for making my game/art/product right off the bat.
So my point is, freelancer.com and similar sites might appear to be exploiting artists, but the fact is, as the artists gain reputation for doing good jobs, they can then command higher and higher pay. Hence there will be a demand for the service they supply - simple economics. If you want to be successful, I'd strongly suggest studying these fundamentals before slamming others for being "immoral" or "unethical". :)