Zhè wèi lǎo shūchī bǎ yíbèizi de jīxù dōu huā zài le mǎi gǔshū shàng.
This old book lover spent his whole life's savings on old books.
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书痴 is affectionate: someone besotted with books. 书呆子 is a criticism, a bookish person with no practical sense. The same 痴 names other kinds of devotion: 情痴 (a hopeless romantic).