“It doesn’t actually hurt revenues that much anyway. And users love it. So why not do it?”
Sure, if you're only making money from per-click advertising like the Adsense used on Wikihow. If, however, you're selling CPM advertising, wave goodbye to X% of your revenue as X% of users turn it off..!
Wrong. CPM is still popular with both high end blogs and strong niche blogs. I sell only CPM. I also believe it's quite common with regular media web sites (newspapers, etc) but I don't have experience with that.
“It doesn’t actually hurt revenues that much anyway. And users love it. So why not do it?”
Sure, if you're only making money from per-click advertising like the Adsense used on Wikihow. If, however, you're selling CPM advertising, wave goodbye to X% of your revenue as X% of users turn it off..!