We have a shelf of nothing but Harry Potter books here. Got them in hard cover, paperback, leatherbound, and even copies in Latin (et tu, Harrius Potter?). Plus there is the spin offs, the books of discussions about the books, etc.
As to the people who don't understand why adults would read them, well, it is more than just a simple kids story. One thing I noticed is that the reading level for each book was on par for the age Harry was at the time, with the final book being more dark and intense stuff that ordinarily would take it out of the children's literature genre. Plus even in the early books, there is so much there that would go over the younger readers' heads that more mature ones would pick up on.
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