Ben Sheets is Own Worst Enemy?

A comment from my "Run Support" post suggested that Ben Sheets has (atleast partly) himself to blame for the poor run support he's had during his career as a Brewer. I am very skepticle of that for two reasons:

1. Almost no pitcher can hit worth a lick

2. A starting pitcher is going to account for less than 1/9th of the total offense anyway.

Let's look at how many runs below average Sheets has been in his career, offensively. I'll use the very rough "basic runs created" equation:

            G   AB   AVE  OBP  SLG  OPS B-RC
NL P, 05   --  288  .150 .164 .190 .354  9.0
Sheets    142  288  .083 .129 .087 .216  3.3
                         -------------------
                                   Diff: 5.7

So, over the course of Sheets' 149 career starts, he's been somewhere around 6 runs below average. Even if you doubled that estimate, it's pretty insignificant. The average pitcher just plain stinks offensively.