Is it against the Google rules to put your Adsense links on your client's site if you are managing it. I'm thinking that I want to offer my clients a discount on web design if they allow my AdSense links on their site.
There does not seem to have a concrete answer from google about adsense revenue sharing (the TOS says it does not encourage ad rotation though), but some big forum sites that I come across are practicing it for quite a while, which the forum admin allow members to place their own adsense code in their profile, and forum will randomly displayed them.
Some blogs are also doing the same if I am not wrong.