Much of the used book market is about buying a ton of books for cheap and only selling a small fraction of them for a lot. If you buy 100 books for $3 each and

Much of the used book market is about buying a ton of books for cheap and only selling a small fraction of them for a lot. If you buy 100 books for $3 each and sell 5 of them over 5 years for $100 each and another 5 for $50 each you make decent money (idk exact numbers but I have several friends in the industry doing 6-7 figs). A lot of it depends on who has the most accurate data. If you know something has sold for $50+ say 5 times in the last 3 years you can pay more for it than an unknown. The long tail is interesting and tough to work.