I totally approve of shared kindle accounts. There's no way I would buy a book twice, once for myself and once for my spouse. You can argue that you can't both read a physical book at the same time, but realistically, nobody buys two copies. You just squabble over who's turn it is to read and the one who finishes first has to keep their yap shut until the other finishes.A related problem I am seeing increasingly are shared kindles and fake returns. The shared kindle problem relates to Amazon allowing a single account to have multiple devices associated with it, thus allowing a single copy of a book to be used simultaneously on these multiple devices, allows multiple people to simultaneously access the same books across these multiple devices.