If you are guaranteeing prices then what's the point of preorders? Basically the people preordering now are giving you a free loan because come february everyone gets the same price anyways. The only benefit of preordering now is if the buyer thinks that you won't have to lower prices and the current price will end up being less then market prices for similar devices at the time of shipping.
Customers who pre-order and pay now have 25% discount. Our promise is that we will ensure that customers who preorder now will always get a better deal than customers who order later.
At the same time we promise that our prices will be below market price at the time we ship.
This means that customers that preorder now will have considerable lower market prices by the time that we ship which puts them in advantage towards anybody else.
Unless Bitcoin mining stops because it becomes unprofitable for everybody else in February, our customers WILL make profit.