>a truly great way of measuring a user session's real value to the advertiser has been invented and discarded hundreds of thousands of times over the past two d

>a truly great way of measuring a user session's real value to the advertiser has been invented and discarded hundreds of thousands of times over the past two decades -- Most advertisers do track and measure actual revenue to them. I think your mistake is assuming junk traffic and bounced eyeballs dont convert or contribute to sales...They do. If you have a decent product with decent margins, each sale can pay for thousands of useless eyeballs. If it didnt work, advertisers would stop.