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					Originally Posted by  Cootey
					 
				 
				[...] Does that clarify things for you? 
			
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 Yes, thank you.  That's very clear.
I would have been less than happy to receive edition updates that were simply marketing (as you noted for City of Bones.).  Conversion updates, okay, they're good.  And, like you, I would be removing any ebooks showing constant updates - if I want dynamic content I'll go to a website.
I do think your experimental approach is probably the most reliable means of finding out how it works for readers.  To keep up-to-date you might have to repeat the experiment every 6 or 12 months, since this stuff may change without notice.