I totally agree, "it depends". Facebook advertising can be much more useful than the OP and many others are suggesting. One tiny little thing that 99% of people are completely overlooking:

-Page owners have the ability to restrict access by country.

This means it's literally just a couple clicks, and you can completely disable the "click-farm" countries from seeing your page (+ advertisements).

http://sendgrowth.com/blog/simple-defense-facebook-click-far... (short post about it, shameless plug) http://i.imgur.com/snkv77Q.png (screenshot of facebook settings page)