Despite different approaches to advertising, one thing unites Apple and Google. Both companies want to hold on to a relatively large proportion of the ad revenue they generate. Apple, for example, proposes to pass on to developers 60% of the revenue generated by iAds. Google continues to suggest it passes on to publishers "at least 50%" of the revenue generated by ads it runs next to publishers' content. These levels of commission will look high to anyone who recalls the 15% commission that used to go to media agencies for bringing in advertising for publishers.