I stored up my allowance for 2 months just to acquire sufficient UC to get the Lucky Spin Royale pass

https://squareblogs.net/kittaniktn/pubg-skins-on-a-budget-tips-for-players-who-want-looks-without-spending-big-043w

I kept up my allowance for two months just to acquire adequate UC to get the Lucky Spin Royale go, making the grind entirely value it.