I saved up my allowance for two months just to buy enough UC to get the Lucky Spin Royale go
https://elliottqbjt074.theglensecret.com/casual-scrub-vs-hardcore-spender-who-buys-more-pubg-uc
I kept up my allowance for 2 months simply to purchase enough UC to get the Lucky Spin Royale flow, making the grind incredibly worth it.