I had a big loss with POR in my portfolio because I bought 30000 shares on Sept 30 at a price too high that was 0.13/share. So my strategy was to buy 6000 shares on Oct 8 at 0.08 and to sell it right away with a gain. My cost average before I sold that was 0.12205. So I have a loss of 102.30. Even if I knew that with the cost average it would be a lost, I have recuperated some money back in my portfolio : 136.10$.