The immersive theatre company's new show Kabeiroi has just 864 tickets (for £110 a pair) and is closed to critics, while its corporate gigs are on the rise. Have the showstoppers sold out?Kabeiroi review: a shape-shifting six-hour mystery tourThis week, Punchdrunk opened its new theatre show, Kabeiroi. This isn't theatre as it is commonly experienced. It is performed for an audience of just two, over six hours, in…