It is true that owning multiple eReaders is not very useful to most people and I don't think there can be a logical explanation for owning 4-6 readers at a time for non-professional reviewers.
But if you've ever been an enthusiast in any field, you know that sometimes you just want to review a device yourself rather than reading one written by someone else. I know people that have 6-10 smart phones (bought off contract) just to play around with.
Some people like to spend their money on luxury goods, others on electronics, others on traveling, so there will be naturally who spend on e-readers!
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