Definitely: "If I can tell from a book's Amazon sales rank that I'll be able to sell it in one day, I might accept a projected profit of as little as a dollar.

Definitely: "If I can tell from a book's Amazon sales rank that I'll be able to sell it in one day, I might accept a projected profit of as little as a dollar." There's no way that's worth even the time it takes to package the book for shipping.