How many times have the Diamondbacks ever traded a young prospect (at least one that was any good) for a mediocre reliever?
In the franchise's first 5 years:
Tony Batista for Dan Plesac
Brad Penny for Matt Mantei
Jack Cust for Mike Myers
Duaner Sanchez for Mike Fetters
Bastita had 191 HRs after the trade. Penny has 74 career wins. Sanchez has over 200 career apperances with a sub-4 ERA.
Granted, Cust was a bust. And Mantei did have 2 good seasons in the 6 years we were paying him. But I think we're much better off developing our young players (like we're doing with our entire lineup now) as opposed to trading them for non-elite veterans.
Go D-backs.