[1va]

This is an excellent point.

I agree that visitors-to-conversions are is the core underlying metric.

But these bounces are a subset, and large one, of the visitors that don't convert. It seems that area of greatest opportunity should be within the 80% of visitors that bounce. Assuming I've got the conversion engine relatively well oiled, I'd really like to draw in those 80% of visitors that virtually walk out the door.