Subject: Re: AI Business model
(I believe they actually invented click through payment),

Nah, our company was doing it before Google was even incorporated : )
We even tried to put together a system that was payment not only for click-through, but for actual purchase, but the site back end payment systems were too diverse to attempt it in production, among other problems.

And I know of another company that was doing payment per click before us.
One subset of their business made the mistake of charging ONLY for clicks, not impressions at all. At least one large advertiser put up an ad that was nothing but their logo, figuring nobody would click, it would cost nothing, and they'd get a ton of brand exposure. The ad ran for AGES before their committed click count ran down.

Jim