Three partners build business on used college textbooks , library volumes . In one drive in 2002 , they collected 2,000 books and then sold them for $ 20,000 the next autumn . They sell them to the public for a profit and then they make money by selling those books back at full price. Revenue has grown from $ 4 million in 2005 to a projected $ 31 million in 2009 . Five to 10 percent of revenue donated to libraries , literacy programs .
Three partners build business on used college textbooks , library volumes . They sell them to the public for a profit and then they make money by selling those books back at full price. Revenue has grown from $ 4 million in 2005 to a projected $ 31 million in 2009 . Five to 10 percent of revenue donated to libraries , literacy programs .