You're very lucky ... it depends upon your site's niche. AdWords advertisers bid on keywords ... if a lot of advertisers are bidding a lot of money on the keywords that appear on your site, then you're going to make more money per click.
How well your site performs also plays a role. If your site has a good CTR and users who do click buy products or services from the advertisers (i.e. your traffic converts for the advertisers and produces results) then you're going to get top pick of AdWords bids among other AdSense advertisers who also target the same keywords.
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The Queen of DaniWeb
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