<i>Ehrm, I'm sorry but my mother and my sister do re-read them and I know many more people who do. I also read them but not re-read them which isn't strange since I never re-read a book of any genre... (good memory + bored easily...)</i>
It really depends on the book, but yes, I re-read some Harlequin books that I bought, oh, 10 years ago.