Well if you want to find a niche which would have decent click value, the best tool you can use is Adword keyword tool. You can find there how much advertisers pay per each keyword. This is the best way to find high paying keywords for your niche or web site.

01. Type the keyword or keyword prase you want to check in the box near ” Descriptive words or phrases ” , fill the Capha (Image verification) and hit the ” get keyword ideas ” button.

02. There you will receive list of keyword, their advertiser competition and search volume. Still you need to find how much advertisers pay for each keyword. So goto where it says ” Filter my result ” and select ” Show Estimated Avg. CPC “.

03. In same place another select box will show up. with a caption like ” Calculate Estimates using Max CPC: ” . Put 100 in the box to find all keywords which cost upto 100 USD per click. and click the ” Recalculate ” Button. Might take a minute or two to receive the result.

04. You will receive the top keywords for the niche you are checking and average cost per clicks advertisers willing to pay. Now your won’t get the same amount for clicks generated by your side but a percentage of it. probably around 40%.

These results can be used for any ppc ad network but you won’t get better earnings than from adsense. expect around 10$ for other ppc networks.