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Primarily to stop self promotion I believe, but also to encourage discussion of technique and method rather than 'review my site' type posts.
mig1234, perhaps you could describe what you've done and what you've achieved so far... which might also lead you to more specific questions or ideas on what you might want to try.
Here are some suggestions to improve clickthrough.
Use Standard Banner (468 x 60) or Half Banner (234 x 60) (You may use multiple Ads).
Reason: These banners in addition to Ultra Leaderboard (728 x 90) do not display the destination URL.
So you would get additional curiosity clicks.
this will make your visitors feel that they are not adverts, but normal articles on your website.
Though this will be deceiving your visitors, but who cares if you need more clicks and more money
Get friends and family to click on the ads on your site.
It's something you can do if you don't want to carry on having adsense on your site much longer and don't want to receive your next pay cheque
Best advise is as per the google adsense TOS is not to click on your own ads or to get anyone else to click on your ads
No doubt thousands of people increase their CTR that way
Don't think so