People are more than capable of getting their money back any time they please. And yes I know it's dollar denominated, every business does that, even outside the "bitcoin world".
That doesn't correspond to the truth. BFL refuses full bitcoin refunds -
https://bitcointalk.org/index.php?topic=137026.0 I have warned people several months ago. What you did is change the title and lock the thread.
Denomination is a proper description of a currency amount, usually for coins or banknotes. For example, five euros is the denomination of a five euro note. Talking about denomination of a purchase order is totally irrelevant! Unless, of course, you purchase a bond. But BFL customers aren't investors, are they? They are just donors.