yea they were before around $80 i guess but now you won't get that ,there are more highpaying keywords like "domain yahoo"
Amount per click isn't always the end all. You have to look at the amount of competition for that keyword (or price for AdWords to get the visitors) to factor in. It doesn't matter if a click earns you $20, if it costs you $25 to get it
MFA = made for adsense---->create site just for adsense not for share information or other In one site just any adsense no any content.
I think you have to write with some keyword optimization, if you write articles totally randomly without any SEO, it becomes difficult to drive traffic through search engines.