 what if I don't mind? I'm just going to let this roll. And if I know that the S&P 500 makes money over time, then this will work. Well, here's the thing. Your down days can quickly eat into what you have because you need a larger up days to recover from bad down days. Now that's true in a non-leveraged ETF. If I have an investment of $1 and it goes up 100%, I have $2.