The primary reason these books cannot be produced in large number is the high cost of design and printing, the relatively high risk involved, and the paucity of good authors. When a good production does hit the market, a few thousand copies are sold but these hardly represent much of a market share.
無法大量生產，究其原因，主要在於這類書籍的設計、印刷成本高，風險性相對提昇，好的作家少，偶見佳作，賣個幾千本，卻很難撐起大片版圖。