More than 7 years ago, I gave up on putting ads on my blog because I had gotten zero revenue. (As it turned out, there was a negligible amount in 2004 before I managed to get them completely off my blog.) Since then, I have generated some revenue based on ads on snowpanic.com and twinpanic.com. Not enough to prompt a payout from Google, mind you, but something.
Lately, Blogger has introduced statistics that show just how many people read your blog. Android's Dungeon is getting about a thousand hits per month, mostly scattered across older posts. So I'm going to try an experiment of turning ads back on to see if I can earn any revenue from these old posts. I thought I'd mention it, just in case you were wondering why there were ads back. If you're not wondering, then like me you've probably installed some sort of ad blocker. If so, good for you.