In Facebook, the more you invest the less you get back

[batman]

Well pal, I am glad you brought this up. Yeah its true facebook shows this kind of behavior. The reason is that facebook is a platform for all kind of users. It targets the most absolute common mass. When you are investing small amount the fb engine targets the most specific users but when you invest more the fb engine has to widen its users number and that's when the targeted mass gets diluted. So, my suggestion is to invest in fb in small amounts part by part.

Exactly, same thought as mine. If you are looking for the most targeted audience then the smallest investments are going to work more good.