The Guardian has an article about collectors who go for ARCs. But I’m not sure the author really has a good grasp on it. The article says “you may get to read the book a month or so before publication,” but I get ARCs for books six or even eight months out. And in my experience, it’s not collectors who are seeking out ARCs, but readers who can’t wait to read the book.
Collectors pride themselves on never reading the book, because any sign of wear devalues the book.