With a little more seriousness, I suppose one could do that for any team (or league), and come up with an "average runs saved" by a plus play. I would imagine there would be a lot of assumptions and subjectivity involved, and that it might need to be broken down by position. But I have neither the time or interest in doing that, at least in the immediate future.
We're now up to 15 + plays in 14 games. Leading the way is my LF (82, 90, 96, 96) with 6 already under his belt.