As it increases, what happens exactly? I've thought that, it's good to have your sillouhette broken up, so i like to crouch in front of bushes. But maybe it's simply that as the shooter's stealth increases, the distance that they have to be from a bad guy to not be seen decreases. (so you can get closer without being seen)

Also doesn't stealth make you harder to find if the badguys are looking for you?