I have always wondered this and it's been this way for years. The latest example of this was at TNA's Final Resolution on Sunday, during the Casket Match between The Pope and Abyss. When Superstars are not fighting around the Casket, the Referees close it. I understand that many unveilings happen when the Casket is opened and "magically" someone is inside it. (It wasn't too long along we saw Paul Bearer in the Casket on Smackdown.) So traditionally speaking, it's kept closed for spots like that. But ruling wise, why do they close the casket when the action is away from it? Wouldn't it make more sense to just keep it open and have the Superstar close it when they are ready too?