Must be very popular and they figure they can make more profit by charging more. Just like with cruises, it's all about supply and demand; if the demand is great, they're going to raise the rates. But right off the top of my head, I can't think of another specialty restaurant that charges that much, so it'll be interesting to see how this plays out.
46 Cruises & Counting! Favorites: Paul Gauguin to Tahiti: Uniworld River Cruises in Europe; any of the Celebrity Solstice-class ships; Holland America for 12-nights in the Baltics & Russia; RCCL for 14-night Greek Isles, Turkey, & Croatia; Holland America for 14-day Alaska cruisetour; 10-night Canada/New England cruise; 21 days in Hawaii including a 7-night NCL cruise; Oceania for 25 days in Asia; & 3 months touring Europe by train. And many days spent in all-inclusive resorts!