I wanted to suggest that when you win a game of skywars, that you'd get like 3 skybucks in return (or something like that). As of right now, you don't really get anything for winning. At least if you won just a small amount of money, it would give you more of a purpose to win. I understand that it's something you can buy in the store, but for the people who can't spend money on it, this would give them a way to earn some money to buy in-game items.
There is already one up. It is a great idea though http://www.mineverse.com/threads/skywars-reward-for-winning.40411/
