Very interesting, and yes there are so many variables driving the prices I usually only profit from pure luck, which isn't very good for any investor, which is why I work 9-5, and then stay up all night to play with my miners . I would consider an investment in this if I thought it would be possible, but considering the specs for the new asics coming out I feel scrypt will lose its value since it was designed specifically to avoid ASIC's which allows regular individuals to continue their gpu mining adventures and also play the matket  game.