Yes,  Bitcoin is perfect for arbitrage scamming, also beware of mining pools that keep hold of your coins.
I'm still waiting on half the coins I worked on Eligius pool in October.
Of course this thing is easier to pull off if you can pay out in 2 currencies. You always win.

I not saying that this is what is going on here, just that this is how it could be done..

I'm selling pre-order Unicorns.
You can pay me in either dollars or bitcoins.
After 30days, if you are not happy waiting for your pre-order unicorn, you can request a 100% guaranteed refund.
I will refund you in whichever currency leaves me with the currency arbitrage profit.
$10,000,000 of pre-order Unicorns, bitcoin value moves 10%, that's $1,000,000 for me suckers!

It's genius, but probably illegal, only banks get away with this kind of stuff!