Notice this tip from Google when I was checking my AdSense revenue. Make sure you check out this new program from Google. Basically, with this program, you'll be paid when your visitors click through to an advertiser's site and complete an action defined by your advertisers, such as a sale or sign up. Of course, the pay per action will be much higher than a click in pay-per-click AdSense.
It's still not open for everyone yet, but you can try to sign up, to be considered by Google.
If my article helped you solved your problem, consider buy me a beer!