Luna gets the returns from the assets the 'real money' was invested in. Terra doesn't. The people using Terra give up their returns to Luna holders for the con

Luna gets the returns from the assets the 'real money' was invested in. Terra doesn't. The people using Terra give up their returns to Luna holders for the convenience of a universally acceptable exchange medium that is pegged to something else of value that isn't universally acceptable. As with all leveraged investments to problems occur when the underlying real assets fail to perform as expected. Or at worst don't exist at all.