I stored up my allowance for 2 months just to purchase sufficient UC to get the Lucky Spin Royale skip
https://www.scribd.com/document/1002950446/Casual-Scrub-vs-Hardcore-Spender-Who-Buys-More-PUBG-UC-188028
I kept up my allowance for 2 months simply to buy adequate UC to get the Lucky Spin Royale pass, making the grind definitely value it.