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Risk is the answer, Moe. Pineda is a much riskier player than Votto. With Votto, you are getting a high degree of certainty with regards to his production. With Pineda, you might get Clemens, you might get Doc Gooden, you might get Gil Mech and you might get a torn labrum in spring training 2012 - there is really no way to tell.
Pitchers are just darn volatile, especially young ones like Pineda.