He can make something in the thousands of dollars a month of income from his blog. That's pretty good, and it probably pays for quite a few monthly expenses, so

He can make something in the thousands of dollars a month of income from his blog. That's pretty good, and it probably pays for quite a few monthly expenses, so he'd be stupid not to put this one nonintrusive ad on there. Not putting a small ad on there that pays thousands of dollars would just be silly. As a comparison, swombat.com has no ads because the amount of money attached to it would simply be too small to bother (tens of dollars a month at the very most, if that much). If it was a few thousand, I'd put a small ad on there even if I had millions in the bank.