[Discussion] why is this so expensive?

I've had this book on my shelf for a few years and just today saw several sold on eBay for $150+, I have no intention of selling it but am very curious as to why it's so expensive, it's a really cool book, but idk about $150+ cool

I've had this book on my shelf for a few years and just today saw several sold on eBay for $150+, I have no intention of selling it but am very curious as to why it's so expensive, it's a really cool book, but idk about $150+ cool