Google Analytics Bounce Rate
I've just been learning about this on my course -I dont think we need to worry too much about those 100 per cent 'bouncers' - they might be just registering the visits of 'spiders!'
However, we should stay well focused on our niches I think, to make sure that what people came looking for is what they find on our pages.
I know you are interested in niche blogging too, so you might like this free affiliate marketing business course I have finished - its called Niche Feast. It's very polished and professional - all about maxing seasonal niches like Thanksgiving, Halloween and Christmas.
You (all) are welcome to help yourself to a
free copy