Nine pounds sterling isn't so bad for an American deck imported to Britain.
I actually think its quite cheap. Though i do not expect it to hit the $50 mark. I'm pretty sure as long as DB does not release it anymore, prices are sure to jump probably $20-30 and maybe even $40 mark.
Do remember that each person has to buy at least a brick, which means e.g for a 10,000 deck print where people get an average 2-3 decks, it works out to about 3-5000 people having these decks. Now which each getting a brick or 2...it probably works out to less than 800. And that is if DB actually prints and sells 10,000 decks.