d45f731d_Pages__and_5_That_Do____Gigaom__Benefits_to_You
[Reason] 4. Because it is easy to do (just click to become a fan) and then ignore. [Interactions on Page] Low to None [Benefits to You] 
Very little benefit after the initial automatic broadcast to the person’s friends on Facebook that they’ve become a fan of your page.
5 Things That Don't Work on Facebook Pages (and 5 That Do) | Gigaom
Benefits to You