My guess is it will no longer make money once zero-fees go away on mtgox. Making money is relatively easy when the bid/ask spread exceeds the fees.
You guess wrong. Actually I am not granted with the 0% fee privilege. I am trading with fees and making +0.5%/day. But yes fees and thin volatility don't go well together, you have at most one or two opportunities per day during a few minutes. The key feature of this bot is it has an algo to anticipate when the bitcoin is underpriced to sell a bit later when it comes back to a proper price.