I tried to use Google AdWords several times with the same result for my website. I have an affiliate program on my site and use it to track all purchases made from all advertising I do. Each time I set up all of my ads with AdWords, and put in all of the keywords for each, they deactivated all of them because they could see it was an affiliate account (Called "Adwords") and they said I wasn't stating I was an affiliate of the site. The account was under the name of my site, the credit card was under the name of my site, and the affiliate link was under their name. After trying to reach them for weeks without anything other than an automated email telling me to look at their help section I gave up completely.

Google has an ego the will hopefully put them where they belong and their adsense targeting is utterly useless. The fact they thing you should pay the same as a search inclusion for their "NONsense" targeted adsense results should be enough to tell everyone to stay away from that type of greed. I've actually been having tremendous luck with the old ppc banner advertising compared to google. FindWhat is also another good avenue for any marketer looking at their ROI.

Good luck