I cant agree to ur theory that seats will remain vacant b/w HWH NJP/ GHY unless dynamic fare forces pax to book from BNC & change BP to HWH, then obviously people wont prefer... If berth multiplexing is allowed juat like Normal Mail/Exp trains & pax are given a chance to pay fair price, I can assure you more than 90% berths will remain booked b/w HWH NJP.