The problem is that it amazingly easy to bias the weights and the actual size of the bias is tiny. So maintaining a per-user ad biased profile is cheap and pro

The problem is that it amazingly easy to bias the weights and the actual size of the bias is tiny. So maintaining a per-user ad biased profile is cheap and profitable. I doubt that "paying directly" will keep out the ad men (after all, Cable TV cost money. Netflix too. Both have ads.)