Yeah but he does 'gain value' if he works his ass off and becomes a league average 3rd baseman. Didn't most peg Bo to move off SS when he was drafted? Didn't he work his tail off to get into better shape and improve his defense to the point that he's expected to stick at SS for the foreseeable future?
If Bo didn't work hard, he might already be at 2nd base, which would hurt the Blue Jays right now.
Being in shape theoretically also increases his base running abilities and decreases the chance of injury. Christ - being in good shape probably improves his defense at 1st base too...wouldn't that be a good thing? Wouldn't it be nice to have early career Pujols defense instead of straight to the Prince Fielder defense?
If Biggio let himself go, got fat, which eliminated his above average speed and made his defense below average at 2nd to the point he had to move to 1st....would everyone be OK with that? or would you criticize him? Personally, I would criticize him as it because it would hurt his career and hurt the team.