How are the publishing houses sure halfway through 2013?

Non-fiction publishing houses Vantilt and Maven are both strongly up in the first half. ... " We're up 50 percent," says Sander Ruys, publisher of the young nonfiction Maven Publishing [3] house. "Now it is true that we are a small publishing house, so if a few titles do well, we notice that right away. This Explains Everything, [4] ed. by John Brockman, published in March, has sold 4,200 units sold. "Moreover, it is our first listing in the "Bestseller 60". It just opened at #57. " ... Ruys explains the success: "Our network is growing and we are still being discovered by journalists and booksellers who then enthusiastically set to work with us. On the other hand we know ourselves better and better which titles are doing well. Furthermore Maven's community is taking shape, thanks to the hiring of new employees. in early 2013 "The pre-read club grows, where people ahead of time reading our books and discuss. Our strategy is to grow a lively community where people speak about human behavior."