I think that it's perfectly acceptable to do a second edition of a non-fiction book, as long as it is labeled as a second (or third or fourth) edition. I can't see why you can't redo your book or series as a second edition as long as you let people know that it's a second edition.
If people think your current version is perfect they probably won't buy the second edition. If they think your current version is 'good but could be better' they may well buy the second edition to see if it's been improved the way they want. And if they think your current version is poor they won't buy your second edition anyway.
All of the above is of course in my humble opinion as an ebook designer rather than a writer.
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