My son’s school held a bazaar and I volunteered to sell used books. I noticed that the ones that sold were the “Character” ones and the bright, sparkly ones. The fine works of literature (like “My Father’s Dragon” did NOT sell.
I was also a little disappointed that we did not sell more books in general. They were so darn cheap. (Ten yen or One Hundred yen) If they had been in English, I would have bought them!