The problem with whitelisting is that while I might trust the site I am browsing, I cannot trust the people the site might have outsourced its advertising to. I

The problem with whitelisting is that while I might trust the site I am browsing, I cannot trust the people the site might have outsourced its advertising to. If a site owner negotiates its own ad deals and serves them from their own domain, I will see them as will many other people. If you don't trust your third party ad providers enough to serve their content from your own domain, why should I trust them? I, and many others, simply don't have the time to determine which advertisers are trustworthy and which are not, and if I did, I do not have the time to follow up with each one to make sure they haven't sold out and become untrustworthy.