nobody's really searching anyway
EDIT: I do find it interesting that Estonia is at the top of the regional interest
even crap keywords can make money, if you have targeted those keywords and used them in proper context within good quality original content, optimized your SEO and have good "click-through-rate" meaning, people actually click the ads on your site after searching Google for your targeted keywords.
but, yeah, clicks from estonia are worth about 2 cents max. You also want to "geo-target" meaning reach the American market. Those clicks are golden.
if you just want to run a website to make money on ads, write about insurance! http://www.wordstream.com/articles/most-expensive-keywords
I used to write a blog that targeted Insurance, Mortgage, Attorney, Lawyer, and Degree. It wasnt really about any of those things, just used the words extensively within the context of a serialized work of fiction. I literally had a paper with my keywords on it and I would write goofy stories using those words as much as possible. I made pretty good money before google got wise and b& me
the blog is still there, but no more ads... a sample; http://gogxmagog.blogspot.ca/2012/02/medical-emergency.html to read it in order you have to start there and go to "new posts" every time. serialized work only works in chronologically reversed order on blogger
note; to be perfectly honest, I made such good money because I fraudulently inflated my traffic stats and secretly asked several American friends to click the ads. ahhh the good old days....