Let's give credit where it's due. The seed of the idea was from something I read in a Paulo Coelho interview.
He decided that it wasn't of any use to collect books. So once he has read it, he would leave it around in park benches, trains, public places. So someone else would read it.
Since I am not generous by nature, I can't bear the thought of giving away my books, which I have spent good money on buying, and time on choosing.
So this is the next best thing.