Harbaugh doesn't only challenge when he thinks he will win. His reactions during different challenges over the last 2 seasons proves that. Sometimes he flips out like the Douglas catch or the intentional grounding for a safety against stl. Other times he barely even grimaces. Those times he knew when he threw the flag that he was going to lose the challenge, I am absolutely convinced.
The Niners have smartly figured out that a challenge is a much longer timeout than a normal timeout and Harbaugh likes to use the challenge to let his team recover from a big play/call against with the extended time out. Plus the added chance that the challenge may go their way and not use a timeout is a bonus.
I would LOVE to see a stat that compiles the total amount of "time out" a team has when a timeout is charged, challenge or otherwise.
To sum it up, the win/loss ratio of challenges is in no way shape or form an indication of Harbaughs miss management of challenges unless you assume he is trying to win them all which I do not believe he is.
[ Edited by WINiner on Feb 2, 2013 at 9:19 AM ]