Why do you take payment for Pre-order items

We take funds on a pre-order to guarantee a position in a queue, This qualifies as a confirmed orders that is shared manufactures who allocate supply to us accordingly, In the past, where funds were not taken, speculative orders were placed across several sites by customers. This mean the allocations to suppliers could not be accurately determined and wrong allocations were made to wrong etailers, Charging for a queue is why we call it a pre order guarantees a queue position.