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The rarest commodity in baseball is Roger Clemens. We have two of those. Roger Clemens happens far less often than Eddie Murray or Edgar Martinez...though they are both incredibly valuable, obviously. But just because we have two of those rare hoss SP aces doesn't mean they're more common than the great hitting first basemen.
I would argue that the trade packages teams give up for Felix type pitchers vs. the ones they give up for Joey Vottos makes my case for me.