I estimate that it would add at least $100 onto the price of a Nightflight to regulate each watch to 5 seconds a day. Then there is the problem of a watch varying from this accuracy rate during the warranty period. A watches accuracy is not static. It often will change during the first 90 days or so. Temperature can also change the accuracy, and the simple act of dropping of a watch can throw it way off it's rate.
I'm not even sure if manufactures of COSC certified watches guarantee that they will continue to perform at COSC accuracy - only that when the movement was tested ( not the entire watch ) that it was, at that time, COSC accurate.
