#5 should probably be rewritten to read:
You should keep your book on the market until it sells (to plenty of customers).
#3 is a toss-up; I don't have a problem rewriting, but usually it's just to fix continuity errors. (In one book, I managed to transpose the names of two characters between the front of the book and the back! And no, I'm not going to tell you which book.) I haven't done a lot of serious rewriting beyond that, other than to flesh out a scene that was too abbreviated the first time around. If you think a scene needs embellishment, by all means do it (or ask someone's opinion to see if they agree).
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