I've always thought alot of it is a wink and a nod by networks and promoters to ensure a major event comes off as set. Everything is resolved today with guys basically making a financial agreement when weights are off or unable (unwilling) to be made. There is no insentive really. Just dock my purse and I don't have to sweat it. They take a trinket off the line if a guy doesn't make weight and make it a one way result, try that with a fighters purse and watch him start running laps.