>Automatic ads might be x10 cheaper, but x1000 less effective.
what are you talking about?
Lets say you are running SaaS for Azure admins. Do you want to buy the top banner on slashdot.com for the whole month, no targetings at all, for 50K/month, or you only want to show yor ad if user was interested in at least 2 stories with azure tag, for 5K/month?
Automatic (aka highly targeted) ads are more effective, not x1000 less.