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Why expensive?
What do you think about it?

One thing I'd pay for it if they promised to stop flashing their ad when I am using YouTube.. but I guess I have to pay YouTube for that.. Grammerly trial is a real scam though.. it will correct one word or part of your text at a time. As soon as you correct the next one, the first one goes back to the text with mistakes. It drove me nuts. So many things in the media are not what they seem.. which brings me to my actual point,

I think it is too expensive for most people - that may be the reason so few authors used it in this post. It may be worthwhile if English is not one's first language, though.