Not sure it's a VERY good reason, but K20D only has a front sensor for the remote. If there's some reason that you need it to trigger from a short distance behind (but can't reflect or reach around to trigger it), then the cable is handy.
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But Mom, Pentax IS rebellious
Pentax K-7, K20D
Pentax SMCP-FA 35mm f/2.0 AL -- Pentax SMC 50mm f/1.7 -- Pentax DA 50-200mm f/4-5.6 ED -- Sigma 28-70mm f/2.8 EX DG IF Aspherical -- Pentax DA 18-55mm f/3.5-5.6 WR
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