this means that every month, my adsense revenue would get bigger, because lower-paying ads automatically are not shown .

This is theory, but i don't really see it happening in my account.. maybe i need more content to display more different ads? Right now i have some ad-space that is not filled in yet.
see e.g. http://www.martialarts.be/oostersekr...tartikelen.asp

anyone has experience with that?