I agree that this is a lot of rehashing things but seriously you cannot truly measure a bad managers impact.  It is too far reaching to be accurately calculated. 

There is the effect of turnover because of poor management.  I can tell you a fact that I was on a team of 15 people.  In a year and a half that team lost 8 people out of that 15.  (Five externally, One internally, two internally promoted to other teams) the result is that you have a turn over rate of about 35% with promotions and 24% without.  The tenure of the people who left varied from 3 months to 12 years so it was across the board.  Either way the money lost in recruiting and training them is gone. 

There is also the loss of talent and business knowledge when a bad manager results in people leaving a company.  As people leave so does the information they have to do their job well on a day in and day out.  Then there is the measure of immediate productivity and the long-term productivity by not developing good candidates.  There is also the bad will that gets created in the market place how a team or position is not desirable because of this boss.  That in turn reduces your applicant pool, which in turn reduces the quality of that pool. 

Bad management can be measured immediately in time lost and money however I believe the real loss is the long-term loss of people and knowledge.  That is truly immeasurable.