1) The links to scripts and images are loaded on every page view?
3) With the script are excluded from the search engines?
Do not be scoragiare by thoughts such as loss of visits and visitors loss.
The equation that you have to think is a: without visitors no gain but with so many visitors without the banner is the same thing.
So it's up to us to educate visitors to behave in a more correct, because many services that benefit them for free and they are only required a quick loading of a banner.