Your analogy is not an accurate analogy, so let me provide a better one:
You go to the store to buy a new X-Box360 for your kid, look at the price-tag which is clearly marked $329.95, and consider $329.95 to be a reasonable price and decide to buy it. You go to the checkout counter, and the employee ringing it up enters it incorrectly for $3.29. Do you:
(A) inform the employee of the mistake;
(B) quickly swipe your debit card and hope nobody notices;
(C) tell the employee you meant to get 9 more units and ask him to simply change the quantity to 10 while you run back to pick up 9 more at this "bargain" price?
I’d never buy an XBOX !
Excellent analogy!