I saved up my allowance for two months simply to buy enough UC to get the Lucky Spin Royale cross
https://www.scribd.com/document/1073477192/PUBG-Global-vs-Regional-Versions-Which-One-Should-You-Pick-Before-Topping-Up-190268
I saved up my allowance for 2 months just to purchase enough UC to get the Lucky Spin Royale skip, making the grind completely worthy it.