The ad companies don't necessarily care about whether or not the ads help their clients' brands. They don't get paid for that. They get paid for other things, l

The ad companies don't necessarily care about whether or not the ads help their clients' brands. They don't get paid for that. They get paid for other things, like delivering impressions. The site that the ad runs on might care about how this affects reader loyalty, but, if they've decided to go with ad networks, they have rather limited editorial control over what ads the networks choose to run on their sites.