I don't know what the real price of a book is right now. Living in New Zealand, where book prices seem to range from the absurd to the absolutely fucking absurd, I feel that the NZ book buying community are already living in the world you describe. NZD50 isn't unusual for some trashy novel. Price already seems determined by whim. There are so few bookshops in NZ (everyone's too busy watching rugby to care about that literary shit) that it's actually embarrassing to walk into a bookshop and ask for a title that you can't find on the shelf, let alone falling over when they tell you how much it's going to set you back.
Really fucking tragic.