sure you mean would have realized a loss if they sold during q1 and early q2 2014? I'll perhaps sell this coin I bought in nov if the price is right.
The sale date is fixed (April 01, 2014) and the price too (480 USD/BTC for the red line). The horizontal axis is when the coins were bought. By selling at that price and date, one would have made a profit only if one bought before mid-November.
However, the plot considers only mean (L+H)/2 daily prices. There were a few "golden windows of opportunity" when the price momentarily went lower than 480 USD/BTC. (For example, 400 on Feb/25, and ~435 on Mar/30--31). People who bought at those prices and sold on Apr/01 at 480 USD would have achieved a fairly large ROI per year.