Easy test.
Everyone asks for a refund, begining with the latest pre-orders.
Once everyone after you in the order log has resigned, you might as well do so, since if you change your mind you can still place a new order right away, and end up at the same place, or close.
Doing that backwards while getting refunds should not be too risky. If you're close enough to the top of the pyramid.
And you can reinvest this cash into better gambles.
What would be the point in ordering something, just to pull the order?
Also - it would lead to the prisoner dilemma and so forth. The persons not canceling their orders would move forward in the cue, and the first ones to reorder would come before later reorders.
Not to mention that you would have no idea who and how many asked for refunds as the orderbook is not open.
If you have ordered, and have gotten second thoughts, It's probably a good idea to cancel and spend the money otherwize. But doing it as a group thing sounds just weird.