Its awful that you recognised that feature by today only. Thats old one and people use it all the time to have the benefits of autonomous trading. Stop-loss is great help when you have to go for the long term trading and you have no time to look over the trading charts, patterns, come online all the time and try to grab those little % profits. I guess with the stop loss things have gotten very much easy where you can simply set the loss % and how much profit to take % so that your trade becomes automatic one. If your coin is falling below your stated % then it will automatically stop your loss and thus you will not loose anymore than that if you are not around the coin trading. Similar thing happens with the profits taking too. :-)