3.8 million children in the UK don't own a book, according to a survey conducted by, or for, the National Literacy Trust*.
Well, maybe some of them have a library ticket. They could always read online, but most probably don't.
But, as Chris H. pointed out earlier, there's more to books than just reading matter.

*Never heard of them, but I stick to my old caveat; never trust an organisation with the word 'Trust' in its name.

Addendum: I have heard of this mob. They're the ones who recruited Premier League footballers to pretend that they can read, and name their favourite tome. It turns out that these jokers are all childrens' authors by proxy, and their favourite books turn out to be the ones they get royalties for putting their names to.
I was going to suggest that these moneygrubbers would sell their own grannies. But maybe they already have ... Wayne Rooney's a collector.