Part of marketing yourself is demonstrating your value. When you do that, you don't need to race to the bottom on price. If you're a marketer, why are you trying to use a freelance site?
I've seen marketers who can setup something as simple as a Squidoo or Tumblr and turn it into thousands of dollars of business. If you can't even do that, I'd say you're not as good at marketing as you think.
I've noticed that a lot of hopeful entrepreneurs overestimate their abilities. And it's damaging to their career. How can you grow and learn if you're lying to yourself?