I wonder how services such as AdBrite would react to your proposals. Adbrite’s response to a correspondent of mine when he complained about hijacking winfixer ads was, to paraphrase, “all adv networks have the same problem – just click the cancel button on the popup dialogue box and then go back to the original site”.

Of course, the fact that clicking on the cancel button has the same effect as clicking on an install button escaped Adbrite’s notice.