Now I have come across toptal.com, Toptal Freelance Visual Designers Network. They do exactly this. They screen all the designers in their repertoire. They do not allow just anyone to sign up to get a shot at working on a project. The really do look and vet all their employees. I can know that I am working with a certain standard of designers. It is great that I know companies they work with would be of a similar high standard.
toptal.com can help with finding long term work and this also interest me. As a creative I am always open to many kinds of positions and new ways of working excite me. They seem to be looking for the best fit for their client and designer. It is not like playing the marketing lottery with them. I just began the process at toptal.com. I believe that they will be doing great things matching me with my next great position and more.