Catcher: do you want him to be one of your best hitters?

Joe Mauer and Buster Posey are compared in this post:

Sunday, February 10, 2013
Maximize lefty batter advantage: get a lefty batting catcher.

catchers:

1. get injured more
2. need more rest so that they do not get injured or wear down...

Mauer was age 26 in 2009 when he was AC MVP and led the AC in BA for the third and final time as well as achieving his personal high in home runs (HR) with 28.  Mauer hit 13 HR in 2005 and 10 in 2012 his only other seasons in double figures.

Posey was 25 in 2012 and he was credited by some with having the highest NC BA.  Posey hit 24 HR.  In his only other season with at least 100 games played (108) Posey hit 18 HR in 2010 in 406 at bats (AB).

So, two modern MVP catchers who led in BA, and had a personal best in HR...

Best bet is get a good hitting lefty catcher but not one who is among your best batters because you'll be tempted and/or coerced into over paying him as Minnesota did with Mauer whose best value is as a really good hitting catcher who unfortunately gets injured and/or needs rest.
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Hall of Famers Yankee Yogi Berra and Dodger Roy Campanella each won the MVP award three times in five years, 1951-1955 when their teams won seven pennants and four World Series.  That was the height of catcher dominance and influence.  However, with players being paid so much money does it make sense to put too much money into the catcher?  I say no.  It's too risky.  That risk outweighs the reward of having a good to great hitter in the most demanding fielding position.