Would not be logical. The game already gives 7150 - 7170 coins, and we do not need more. And if it was for cosmetics, then that would also not be logical, due to the fact that people would just farm Gun Game and get heaps of cosmetics.
Gun Game isn't that hard to win, and it doesn't need prizes for winning it. We need to keep stuff like coins and cosmetics not that easy to win, so then people will buy coins, and the devs can make at least some profit.
I hope you understand why this will never be a thing