Supposedly a 240Q is a Grand Complication movement but not the Chronograph annual calendar from a 5960. It's hard to say whether a chronograph is more complicated than a perpetual calendar. Chronographs of varying variety (cam-type, column-wheel-type, vertical clutch, horizontal clutch) are all available at fairly low price points. Generally the least chronographs start around the $5000 pricepoint (although many of these are cam-type instead of the preferred column wheel type) where the least expensive perpetual calendar start at around $10,000 (Baume et Mercier or Montblanc).
Pricing done by the brands are surprisingly not done by production margins nor costs at all. It's purely based on assigning the watch to a price bracket in the market. For instance, an annual calendar isn't that much easier to make than a perpetual calendar actually (although the annual calendar doesn't go through double assembly). But Patek Philippe priced the annual calendar to be right between a time and date Calatrava and a perpetual calendar and that's where it's going to stay. If you look at the number of parts; the annual calendar has more parts than a perpetual even.