It's known that in Adsense you have to use layouts and sizes that promote viewability of the ads, so they can be clicked, as it is a CPC system. You have to be careful though because too many clicks (high

I haven't read the book but to make 25K monthly from Adsense, first you need to drive a lot of traffic to your site. And that's not easy to do. If you manage to do that, you should consider switch to Ad

The real argument against depending solely in Adsense is what you have briefly mentioned in your post. Is that G can always cancel your account and ban you for life even in cases where the publisher is