Do throws to first do anything?

Yes they do.

Based on actual data from 2002-09 the stolen base percentage of a runner decreases if at least one throw is made over to first by the pitcher:

	Stolen Base Percentage
No Throw Made	75%
At Least One Throw Made	64%

In fact, it even makes a difference if he makes more than one throw:

	Stolen Base Percentage
One Throw Made	66%
Two Throws Made	65%
Three or More	64%

Both of these conclusions match what we found last time. If it's your pitcher making the throws, cheer him on. But if it's the opposing pitcher, it's your job as a fan to let him know that you don't appreciate all those throws!

So the more throws, the worse chance the baserunner has of stealing second.