I earn by affiliation banners. In my field such banners change very often, because the provider change bonus, offers, new products,...
I decided to put and iframe with <meta name="robots" content="noindex, nofollow"/> that lists all the external banners. But now I scare that could be considerated by google like a black hat: because it hides the banners.
Can someone tell me if I am doing something wrong or what is the best way to display external banners?