"The problem is that the average textbook sells a small run of copies, and doesn't benefit from economies of scale" WHAT??? for example, stewart's calculus boo

"The problem is that the average textbook sells a small run of copies, and doesn't benefit from economies of scale" WHAT??? for example, stewart's calculus book has been used for twenty+ years all over the english speaking world. you find me a ny times bestseller that has had that kind of run