Recognizing the Freelancer/client based on their work history in oDesk is very Important. In this case I believe Envato Market has a very Good System. We can introduce an Icon for the Following
These Icon can be added besides the job applicants name in the job application page. I believe this will help the CLIENT & the FREELANCER to STAND OUT.
To me it's irrelevant how long client is here and how much he/she spent, etc. Once I was cheated by someone who already had over $50.000 expenses. And too many times I had really nice experience with people who just got registered here.