I started playing with one of those sites recently. I advertise myself at my real rates and in my pitch I mention my relevant career background, include my CV a

I started playing with one of those sites recently. I advertise myself at my real rates and in my pitch I mention my relevant career background, include my CV and a link to LinkedIn where they can see all my recommendations and then end explaining how it's actually cheaper to hire me as I require way less time to deliver high quality projects, so they end up paying the same or less for a better job. So far it worked once and the customer is so happy that has kept the contract opened for now to request more things, but I've been applying for just a couple of days.