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Cootey, I am a little confused. Are you asking this from a reader's perspective or a publisher's perspective?
On the publishing side:
Smashwords make it easy to update existing books, I've done it with a couple of my short stories (one to fix some text, the other to fix a cover error).
The only experience of book changes I've had with Amazon was when I changed from using BookBaby to going direct. In that case the old edition had to be deleted and the new one added. This was a shame, since the reviews on the old edition got lost as well.
On the reading side: Kobo has not told me about updates to books I've bought, and I never go looking for updates. I don't expect fiction to change, and for non-fiction any significant changes I expect to come out in a new edition (separate book). I guess it doesn't have to work like this, it's just the way I've grown up expecting it to work.
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