@Neon

Lol, what. People buy plenty of other books, not just Book 4.

Edit: Actually, people buy book 4 the most because they think it's worth IM these days, and want to trade 10 books for a present case and a transfer mirror, and the book4 tend to be the most expensive. But compounders still need/buy book1 and 2, I know I do when I see people selling them, unless they ask for 600k.