I would save the 30 PP especially if you feel that you will use them at some point. If they will expire, then of course that changes things. I am usually able to get Polaris upgrades for 40 PP, so I value them much more than $280. And even if I use skip waitlist, for me on the legs I travel, the $ value of each PP is about $20. So 30 PP would be worth at least $600.