This is just info for would-be authors and members here who would like to write their own books in future. The book trade is quite an interesting cartel in Singapore (and perhaps everywhere else as well - Will can enlighten us about the US market since he is a veteran author of books)
For example, if the author plans to sell his book in the open market at $50, and hopes to sell the book at our major bookstore chains. The chains will not deal with an individual, so the author will be referred to a middleman know as a 'distributor'.
The distributor then signs a contract with the author and then distributes the book to the bookstore chains. The industry standard is that the distributor expects a minimum of 60% discount off the recommended retain price of the book. So if an author wants to sell the book at $50, he will have to sell it to the distributor at $20. The distributor then sells the book to the bookstore chain at $30. And the book is retailed to buyers at $53.50 (inclusive of GST).
This is an "industry standard" so there are usually no compromises. I'm sure someone like Benjamin, who works for a bookstore chain can attest to that.
So...