I've only got one reader at the moment, but am likely to get others.
Although Harry's reason is perhaps the most honest, I can think of another reason, which is that although I enjoy reading with my new reader, it's not perfect - I can't read everything that I'd like to with it. When another device comes out with better contrast, or colour, or that is larger (so better for PDF/comics etc.), I might choose to get that too.
Even with "perfect" readers, different form factors could be a reason to have more than one - a paperback size and a coffe-table/comic/newspaper size perhaps.
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