I thought Amazon has a large warehouse but I think it is only virtual.
Forget a bit about the possibility of fraud and all that. Once Amazon sells any product they will want to get it out of their warehouse and shipped ASAP. This is because they're basically losing money on their inventory space. Space that could be cleared out and have new inventory come in to replace it and be sold in turn. You'll probably say that you're only one person or they could spare a bit of their space to accomodate their customers. But in reality they can't. The whole business of Amazon is built on the principle that it is a warehouse that depends on clearing its inventory in record times so as to accomodate the newest products and continue the cycle again.