I have recently told my parents about Bitcoins. (They know a little about it from news ect.) And that I had bought some a few weeks back, And sold at $1100 and bought back lower, But not as low as my original buy in price, And they are mad that I didn't just hold and that I have lost a "Profit margin" Even though I've gained more bitcoins than I had.
 
   So, I guess my question is How can I explain to them why selling high and buying low is better than just holding?