Share your insights or perspective on the financial matter presented in the input.

Why can't you just have someone invest for you and split the profits (and losses) with him?
The issue is the time frame. With a one year investment horizon the only way for a fund manager to be confident that they are not going to lose their shirt is to invest your money in ultra conservative low volatility investments. Otherwise a year like 2008 in the US stock market would break them. Note if you are willing to expand your payback time period to multiple years then you are essentially looking at an annuity and it's market loss rider. Of course those contacts are always structured such that the insurance company is extremely confident that they will be able to make more in the market than they are promising to pay back (multiple decade time horizons).