Perhaps you need to delineate the difference between game design and game programming. Have some sort of guidelines on what an aspiring game designer should include in his/her postings (eg character and environment designs, description of plot, description of gameplay) and allow them to develop this over time in the same way that a fiction writer would.
Also, encourage people to think about designing their games on paper as a skill in its own right, and not to jump too quickly towards programming. Once they have a detailed plan, they can then put out a call for experienced programmers to help them out.
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Spending as long as I do here, it's easy to forget that Oddworld has actual fans.
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