Yup, instead of looking for others try on improving your sites traffic. Then you can earn better than now. And if you get more US visitors that would be good. - Mr.President -
If you have a very specific site then I do suggest joining an affiliate program related with that industry as this will pay you better commissions than clicks. Bringing in one or two sales a day. On a daily basis I see affiliates making $150,000+ a month from a single program.
AdsDaq is amazing, I am using them and getting a solid fill rate. My fill rate is in the 65% - 75%. They don't have a minimum page views and they do have text ads. One advantage, is they contextualize their ads so it matches your content. And the best part, you get to set your CPM rate!!
As mentioned earlier, if your site is targeted to a specific niche then, you should try affiliate marketing (cj.com). If you have a lot of traffic, you can sell ad space directly or check (buysellads.com). Also, CPM networks are another option but, they generally don't accept sites easily (most require a good amount of traffic) and usually adsense would pay better.
you can look at: http://forums.digitalpoint.com/showthread.php?t=8576 http://forums.digitalpoint.com/showthread.php?t=253056 http://forums.digitalpoint.com/showthread.php?t=116750 http://forums.digitalpoint.com/showthread.php?t=93578
unfortunately chances are slim you would make more; unless you can sell ad spots monthly/weekly. you can try posting on webmaster forum buy sell. also try buysellad.com.
How about for websites that has specific bandwidth limitations. and per click of clients can used up all the bandwidth.. considering not all visitors will have to avail and click all the links indicated at the website? Kudos Events Management International www.kudosinternational.ftml.net