I’ve been putting Google Adsense Ads on Lee.org since 2008. Initially, it earned about $300/year. Now it’s down to about $100/year. The vast majority of my web traffic is from random passersby. Since I don’t want to bother my friends with ads, I’ve changed it so that the most recent 3 months of content are free of ads. About 1 in 1000 page views generates a click on an ad, each is worth $0.10-$0.30 to me.
if( get_post_time() < date( ‘U’ ) – 7776000 )
7776000 is 90 days in seconds.