Yes, I'm quite wondering this now, because I've realized that marketability is driving writers nuts. I admit, I strive towards getting published just like the next author, but that doesn't mean I'm going to give up on the fun side of writing.
Here's the issue. More and more writers are worried about certain scenes. They excuse themselves that they introduced them, promising that they will be relevant in the future of the story.
Um... you're the writer. I trust you that everything you wrote in there is for my entertainment as well as for the benefit of the plot. So what if your characters are taking a detour? I'm reading a book, which means I want to enjoy myself. I'm not hurrying toward the end. Now, don't get me wrong. That doesn't mean that I'll wait for you to describe every rock and leaf on the way. But what happened to sinking a scene in just for fun? Because it's funny, because it helps with character development and such.
I know we're all cursed by trying to reduce the word count (well, especially me), but that doesn't mean that every single word has to drive the plot forward. I know some of you might think that I'm wrong. But I'm fed up with reading marathon books. At some point, I want to feel the relaxation of a weird plotline that leads nowhere.
And here's where trust comes in. Since I'm the reader and you're the writer, I trust that you know your world better and that you know what you're doing.
Works the other way, too. I'm the writer. Trust that I know what I'm doing with my plot, my characters. Don't complain about them until you reach the part that confirms it doesn't make sense (because first drafts tend to do that).
Writers! Empower yourselves. Give yourselves the chance to fool around with your characters, with your scenes - have fun!
That is all