I dont know some, But if you buy now BTC maybe in the future it will go to 1000 dollar. So let say 1 BTC = $300 over one half year (maybe) than you have earn 700$ doing nothing 
Some newspaper claim that this huge increase in bitcoin's price is due to China's capital control. It prohibits its citizen transfering money bigger than $50000 so maybe people there are buying bitcoins? But we don't actually know why. Therefore there's nothing telling that it will get 1000 dollars in the future