Well , since it it just about up/down, then people with good intuition can make good money at it. And i would like to tell something about astrology. I used to play around with this concept of trading ( there is an astrologist traders club in russia, and they have their one software, i have seen it work, and it shows great results in trading, not for sell though ). I made a chart with all the planet diversions for year 2003, and put the price movements on that days on this chart. There was some system visible, but i did not finish my research. My hdd broke down, and since then i don`t have enough time to continiue it.