The need to keep the phantom line hovering around $1k. They've made a mistake pricing it at $1400. They probably wanted to increase their margins (another page from the Apple playbook), but it will sadly turn out to be a mistake. Sales will not compare to the P3 line. The new enhancements don't justify a $400-500 increase considering the camera is the same. The P4 sales will not be as strong. DJI will reduce its price within 6 months and will probably release a second model as well.