It's not a question of how much money they make, but how they make it. An advertisement should be a one-way channel from the publisher to the audience. If infor

It's not a question of how much money they make, but how they make it. An advertisement should be a one-way channel from the publisher to the audience. If information is flowing in the other direction (particularly if without the audience member's express permission) then it's become something more than an advertisement and that's a good place to draw the line.