In my experience and base to my interview to other adsense success guru, if you create your site for adsense purpose, avoid internet marketer niche because this people hate adsense and they will never click on google adsense.

No matter what blend you do in your adsense, they will always recognized adsense ads. I have also a site that mostly related to internet marketing even the site get good traffic (500 unique a day). But I am lucky enough if this site made $.50 from adsense daily.

If you can’t avoid this niche because you’re knowledgeable enogh to it, I suggest used affiliate programs to monetized, you can make more money it especially if you sell something related to internet marketing. IMers are willing to spend money as long as this benifits them, and take note they have money to spend for good products.