Do Readers Even Care About Editing?

I guess this is more of a concern than an insecurity, but it seems like an appropriate topic for the Insecure Writers Support Group, founded by Alex. J. You-know-who-I'm-talkin'-about Cavanaugh.
We writers talk a lot about the importance of editing and spend countless hours polishing our pieces and seeking knowledgeable feedback before editing and polishing some more. And that's just to get it ready to be considered for publication. Before it makes its way onto Amazon, most of our manuscripts will be subjected to further scrutiny by a professional editor.
What I'm wondering is---is all this editing a colossal waste of time as far as readers are concerned?  I mean, sure, for our own satisfaction we want our work presented to the world in its most polished form, and there will certainly be other writers and critics with their eagle eyes upon it, but does the average reader even notice or care? I'm kind of thinking they don't.
If they did, how would books like Twilight, The Hunger Games, and Fifty Shades of Grey become such consistent best sellers? It seems that once enchanted by a plot and/or characters, most readers are either willing to put up with or don't even notice that a book is in sore need of another hefty round of edits. They'll overlook repetitive phrasing, inconsistencies, and awkward, often incorrect, sentence structure so long as the story itself has pulled them in.

So if readers don't care about editing, why should I? Why should any of us?