Right...here's the issue with editing CONTENT after a book is released....
It kind of smacks as unprofessionalism or knee jerk reactions. I am of the opinion that if you're going to edit a book post-publication, you would in essence almost be enforcing whatever prior bad review forced you to knee jerk.
There's issues in every book. Typos, syntax, magic eyes, timeline problems...ya know.
You walk a fine line. If you publish a book with a traditional publisher, they're usually checked for syntax, continuity, etc. but mistakes happen. Things slip by. We're human.
You might see things like that changed in between hardcover/paperback and different edition printing, it's kind of why "rare book collectors" thrive.
The first edition of The Wise Man's Fear did not have a numberline. By the time it went to the bookstores, it was already in its 4th printing. That made the "true 1st" a collector's item.
With digital books you won't have people on ebay bidding for your typo filled original MSS.
As far as correcting minor glitches like the ones I mentioned above, I don't see a problem with it.
But, if you cave to a reviewer who said "Jimmy's story arc was unfulfilling." and now you release a second edition where Jimmy has a new subplot involving his unrequited love of Veronica, you're probably going to end up losing that battle.
Then we end up with Street Fighter IV Super Ultimate Fancy Shiny Edition.
You should take what the review said and if you can find some truth in there, learn from your mistakes and write the next book keeping that in the back of your mind.
Do you edit for style because one reviewer said they didn't like that you used short, blunt sentences instead of purple prose? Absolutely not.
That's like spitting in someone's eye and telling them its raining.
If you go through with that edit and push the new "updated pretty prose" to Amazon, they send out an email blast saying that there's a new edition available.
And I'll use small numbers here...say you've only sold fifteen copies. And fourteen people loved the fact that John's head exploded.
Now it reads "John felt the hot bullet pass through his brain, he thought of his long lost unrequited love with Jimmy Bell Dean and the mysteries of the world. He imagined that he did not get a chance to kiss her goodbye. Blah Blah Blah. Yakkity Smackkity..."
You're going to make those 14 people mad
Because you can't go back.