I'm no expert, but my guess is that ASA determined that bats made of wood would never come near exceeding the performance standards that the 2000 and 2004 tests require.
The link below provides some information on ASA bat and ball standards. Note in the third paragraph on page 1 where ASA acknowledges that wood bats don't require certification.
http://www.phys.utk.edu/demoroom/MEC...m_Overview.pdf
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