It seems to be "unproof" from minimal price fluctuations (like those from 2013-05-09 09:00).

I think it could be improved adding more smart algo to decide if to buy/sell (ie concerning also wallet history)
Did first step in this direction - just pushed mod which gets wallet history and displays it under chart.
Now we can think how to use the data deciding on current trade ... maybe some additional "wait" mode ? (as extention of currrent tradeEnabled flag)