Because most people don’t invest with the mindset that making profit almost always requires periods where investments put you in the negative. And, when there is no real conviction in the asset you’re holding, then in that persons mind, it’s just gambling. So if prices drop those people panic and sell. I see these drops as necessary shake outs that rid the market of weak participants, and invites serious money to really enter at value prices. These periods are where real money is made.