We action simultaneous trades to lock in the % spread of arbitrage, this is only possible as a % of our funds continue the "speculative" path and remain in the form of bitcoins as a buffer.
So yes, it works out as planned, or we simply don't do the trade.
A word of warning, this has a different risk profile to speculating on Bitcoins, as Arbitrage has in all honesty not out performed Bitcoins insane increase in value over the past few weeks. But again, this is tailored to the segment of our investors that would rather want to see a steady 5% return per round trip on their Government backed currency (Australian Dollars / US dollars / Chinese Yuan) than speculating on the unpredictable fluctuations in the value of Bitcoins.
To keep our machine churning, we're always struggling to find enough bitcoins to buy at market rate with USD. If you think you can help. PM me.