Do you know better options than Google Adsense? Since it takes hell lot of time to reach 100 until you are not Jeff Bezos or Mark Zuckerberg. What do you think so?
AdSense is still one of the best and high paying PPC program. I personally did not find any program that pays you like AdSense. If you are unable to make most out of AdSense then there is no way you can make out of any other programs. You have to provide high-quality content on regular basis and increase your site traffic.
Don't you think that if a site has high traffic, then advertising its own space would be a better option? Digital Forum is also doing this.