If Rolex put a tourbillon inside its most expensive watch it would cost the price of several Rolex Daytonas. It would also mess up their pricing scale and, well, it just wouldn't be a very Rolex thing to do.

A tourbillon makes a watch more accurate by counteracting the negative effects of gravity on the movement. Breguet invented the tourbillon during the age of the pocket watch. Pocket watches were frequently kept in a vertical position in a pocket for a long period of time.

A tourbillon places certain parts of the watches internal mechanics, (the balance wheel and escapement ) into a rotating cage. The escapement is a component of the movement which is comprised of the hairspring, balance wheel, and pallet fork.