Unsurprising for Dominos. In the UK their pizzas are consistently 2x the cost of a good takeaway pizza, or 3-4x the price of something equivalent to Dominos in quality. They only exist because of brand recognition.
Very true, but Dominos is a lifesaver in Japan. In my experience, it's one of the few places where you can order a pizza online in English and be certain that it will actually be delivered.