The reason it's nice to be able to re-download books from B&N (for me) is that I have noticed that occasionally publishers release updated versions of an epub I have purchased that B&N places in "My Library" instead of the older version. I assume there are, or hope at one point there will be, updated versions that remove some of the errors and issues with the first version I purchased.
B&N doesn't tell you when a book you have purchased has been updated, or mark them in the list as being updated since your last download, so once a year or so, I just re-d/l the whole lot and process them. I don't have so many there (maybe 200) that it is a burden to do.
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