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With all the spam going on why don't you implement a policy that says when a client signs up they can post two projects, and then they would have to verify payment to post further projects. I am seeing more unverified clients posting several of the same jobs several times a day, and they never verify payment or hire. This means they're either awarding the work outside of oDesk or they're so incredibly bored they want to come here and post projects for fun.
"Fairness is giving all people the treatment they earn and deserve. It doesn't mean treating everyone alike-Coach John Wooden"