I'm curious. I've once seen a review of one of their miners on ArsTechnica and it seemed like it did exactly what it said on the box, with the specs they claimed. Why, or in what way, are they a scam?
They take pre-orders for miners, mine with them, and then ship them to you when they're no longer profitable. It took a year and a half for people (not paid media outlets) to receive their miners. Anyone who asked about it or complained was instantly banned on their forums. You'll get your miner from them, as soon as it stops making them money. Buying something from Butterfly Labs is like investing in them indefinitely with no returns. They also don't offer refunds.
That makes bitcoins a commodity, not a currency.
You have literally no idea what a currency is, do you?
Why pay $822.9 for a bit coin when you can mine one for $1.06 (allegedly)?
Go ahead and mine a bitcoin for a dollar. I would really like to see you try it.