I had an idea, inspired by a post on these forums some time ago, to add a scene in my WIP that gives more depth to the world. It doesn't have too much to do the with story, but it does add mystery to the world of the story as well as give a supporting character a little more depth.
If you came across such a scene and found out that it doesn't add to the main story, would you get frustrated? Or would you send an email to the author asking him/her to explain what that scene meant and why s/he decided to ruin your day for leaving such an open-ended mystery to be mulled over by your over-curious mind?
There is a difference between the two. One is negative (the first) while the other is positive.