Why -karma?

This is why:

I haven't read the whole article, but...

If you haven't read the whole article, well, maybe the answer was there. Or maybe it wasn't. Anyway, it seems that you consider your own time too precious to read the whole article just to get the answer, but you don't mind spending other people's time reading your question and answering it.

Generally, contributing to a discussion below an article saying "I didn't read the whole article" (or even not saying it, just: not reading the article and yet discussing with people who did) is impolite. The discussion is supposed to provide additional value for people who did read the article.