The non-logged-in section of Diesel's site indicates that your purchases will be available in your bookshelf, with no mention of a time limit.
It may be unreasonable to expect them to be available forever--but it's also unreasonable to be unable to transfer ownership of a purchase to another person. I've got little sympathy for ebookstores that treat purchases like licenses. If it's a license, they may be obligated to continue to provide access to it.
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