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Keep in mind that when, as Ben says, Amazon's "book store claims something like 30 million titles", that doesn't mean they are able to supply 30 million titles, even if you take third-party sales into account (as in "Available from these sellers"). And of course it doesn't mean they have anything like that number of titles in stock.
It's more likely that the figure refers to the number of books that have an ISBN for the countries and languages where Amazon operates. In theory, any bookseller can order any book with an ISBN, but that's not much use if a book is out of print and any second-hand or remainder copies on the market can't be traced.
So the figure of 30 million doesn't really mean much, nor does the fact that it's 60 tmes the number of ebooks available.
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