Pre-orders are solely for the benefit of the merchants so they don't get stuck with unsold inventory. I don't often pre-order but when I do I have no problem if they don't charge my CC until it ships. If they never get the product then I have not paid for it either.
Remember the saga of the Presto Punch? Some people prepaid for that a year in advance.
"I have not failed . I've just found 10,000 ways that won't work" --Thomas A. Edison