However, I can just change the dollar values to increase it to 30 people saved, or whatever.
Sure, but it seems to me that the effectiveness of the box is (should be) a critical factor in deciding whether or not to use it. If the number of people saved is small enough, it seems like the box shouldn’t be used; if the number of people saved is big enough, it seems like the box should be used. The point at which we switch from not using it to using it is a number we should be willing and able to calculate before we use the box.
Sure, but it seems to me that the effectiveness of the box is (should be) a critical factor in deciding whether or not to use it. If the number of people saved is small enough, it seems like the box shouldn’t be used; if the number of people saved is big enough, it seems like the box should be used. The point at which we switch from not using it to using it is a number we should be willing and able to calculate before we use the box.