Yes, mbn is a big gamble. Don't get attach to it, it isn't AFL.
Few things i always avoid is stock trading
1) Loyalty & attachment
2) Average down
3) Investing in company with massive debt
4) Holding on big loss & taking small profit
5) Revenge
These will guarantee your capital killer. I know that sp will plummet back in feb 2013 when sp broke the support of uptrend line. Trend is you friend.