Just like there being a limit of 5 mines out at a time. Its a game. So what. Things need to be done to make sure it isn't nuts. If you've ever flown on all mine launcher boats, you see quickly how insane it would be if all mines stayed out and if mines went past 5. In a 2v2 with 4 ships on the same loadout there is the potential of there being 100 mines in the air at a time.