What is the going CPM rate for an extremely low CTR user base these days? Between what little I know of that and my browsing rate, seems to me like I could set a purchasing limit of $100/year for bidding on my own eyes, probably win enough to almost never see anything but my own small/short "be a good person" reminder/ad on any of the Google ad networks that do CPM bidding, and still not hit the limit each year.