Drop the high paying keywords, It's useless... You'll find later on that you're just chasing ghost in the middle of the night. Just go on the topic you like must, passion, and patience is important. You'll never know what I'm talking unless you'll never go for a very long road.
I saw this thread but don't know how accurate the info is forums.digitalpoint.com/showthread.php?t=783358
I found once in a while on the content network you can get some pretty high paying clicks. I also think once the advertiser sees where it came from they fix the content network issue I am happy with anything over .20, clicks I get run from .02 to 1.75, average is near .40 I am pretty sure others here have said what I see as the best paying niche area's.
The key to use high paid keywords in Adword is to rank your site high in Google with them Payout may be not as high as ads on the G SERP, but you get lots of clicks. After all, it really is a matter of # of visitors and clicks.