Ken,

You should use that $6,000,000 or so in pre-order money and buy BTC now.
If you expect the price to hit $10,000 (I do to) we could have $60,000,000 to buy cost price miners for the farm.
If customers want their refund give it to them in bitcoin (they were buying miners anyway) or just cash out the required amount of $.

On another note you really should give us some sort of timeline, we have been behind you all they way.