I wouldn't worry about it. It's a program for copying a website onto the local hard disk. Usually so that it can be viewed offline but in this case, given all the positive comments recently, I wouldn't be surprised if someone is making a copy so they can refer to it later when re-designing their own site.
It could well be less bandwidth than if they kept coming back to have a look all they time they were working on their own site.
Mike
PS. three of your best seller images are around 40K Bytes each. If you're worried about bandwidth then you should fix these (the ties and braces images).
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