Hi Here are 2 videos on how to use Facebook targetting to advertise at the lowest cost per click price. You can see the tutorials at: http://YouTube.com/user/biz2go Also see: http://digg.com/business_finance/Facebook_pro_ad_targeting
This works... I posted in a thread a month or so ago on CPM targeting and how I managed to get a CTR of 0.5%... meaning I paid 5c per click (25c CPM is Facebook's regular rate).
Cheap clicks are good. But it's also important to take into consideration the kind of product/service being promoted. Because a click doesn't mean a sale obviously. And Facebook traffic probably has a very bad conversion rate when it comes to sales.