Why Members don’t use like button!

My question is why members of DP don't use like button.
I have seen only few posts with likes (Maximum 4 Likes Maximum).
It seems like either it is hard to use like button or It cost money.
Few posts I had seen those had few likes are mostly about insulting someone. Like recently I say a post about "Why adsense reject me" And in reply someone posted "Because you are a theif you are idiot you just copied past contents from other websites, you stole their work, you should be shamed of your self"…
Why Members don't use like button!

See original post by Mary101