Hmmm...I imagine it's a combination of me (at the moment) having to do a lot of combining the same book in multiple formats (I don't like converting, I like having the retails of whatever formats I can get) and the fact that I'm a bit OCD (so it's driving me crazy that the numbers would indicate I have thrice the number of books I actually have).
By the way, I know that's the purpose of the id numbers, but iterating over the books and adjusting the id numbers as part of database maintenance would in no way harm their functionality as ids. If anything, it would optimize it because some functions (I'm sure) would iterate over id numbers sequentially. So, for every id number without a corresponding entry Calibre would have to identify the situation and move to the next number.
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