How does this differ from a pyramid scheme now?
In a pyramid scheme, OPT would promise X units to redistributers who pre-order for Y cost, with the promise of further units once those are sold. Those redistributers would then sell some X+x' pre-orders to customers for Y+y' cost, banking on the full sale and eventual claim of additional units. Some of those customers might then attempt to sell x'' units on ebay for Y+y'+y'' cost attempting to bank on the promise of a quick return. And thus the pyramid grows wider as it goes.
Craig and EvilDragon are basically a straight line to the end customer. A few bumps in the line, but for the most part it's all top to bottom.
I think the word you were looking for is "Ponzi" scheme, where it needs an ever increasing influx of investment to cover the principal and promised interest of the earlier investors, but even this fails: when a ponzi scheme fails, only the newest members lose whereas here it would be the oldest pre-orders that would lose. Also not quite accurate because a ponzi scheme takes new investments to cover old investments whereas OPT is no longer accepting pre-orders to cover old pre-orders: they are making outright sales to cover old pre-orders. This scheme necessarily has at worst a zero return, meaning old pre-orders hang in limbo for eternity, and at best a positive return, meaning Craig really is shipping old pre-orders with each new sale. If they start taking pre-orders again, THEN we're at risk of the kind of negative return that causes a ponzi scheme to collapse.
