OK, i give up... that's ridiculous logic. It won't be all, it won't be none, it will be some reasonable number of cancellations. We can debate if it's 20%, 50%, or 70%, but it's certainly somewhere in that range. Admittedly, that's a big range. But it'd be crazy to ignore the possibility of ANY cancellations as you seem to be saying. So you are assuming 0% cancellations by not even factoring this in. That's a more egregious error in judgment over picking some reasonable percentage of breakage. And no one can "double their order" as you list as a possibility.I'm going with what we know. You shouldn't build speculation into exact numbers.
For example...maybe everyone will cancel their order.....maybe no one will cancel their order....maybe people will double their order...who knows. Those maybes shouldn't be considered in conversations such as this.
And by the way, breakage estimations are a standard part of demand forecasting, so I'm not promoting some crazy theory here.