I know a lot of people, especially writers, who don't understand the difference between "buying" likes and advertising via a "like campaign" on Facebook. The critical difference is that when you pay someone to ensure you get a certain # of likes, you aren't getting targeted audience members - you're just getting junk. When you do a like campaign, you're simply advertising your page and those who are truly interested will give you the like you are hoping for.
I wrote a blog post the other day about how to set up a like campaign that shows in the news feed instead of in the sidebar on Facebook. I've found this to be more effective, a better investment for my very limited marketing budget, and helpful in advertising my freelance business (and any business).
Hope someone finds this helpful (screen shots in the article). http://www.writeontheedge.com/creating-a-like-campaign-to-show-in-the-facebook-news-feed