It seems to me that there are only two things to consider in making money from Google Adsense and Adword;

1, Good,content rich site,and

2, Keywords selection knowledge.

Forget about to much people in your preferred market,if you able to make the first 3 on a search,you might sell.Traffic to a site is all about popularity,price,competition.

The more you understand how ppc search engines works the better.

what, precisely, is your point?

The point is,if you intend to make money online,you must familiarize yourself with how PPC search engines works

sorted, then.