my UA, AA, US mile balances are never so high. I have tried to burn them at good rates to save cash out of pocket. SPG points saved for mainly transferring to AA on every 20k each, so far only 10k SPG points are used. Hyatt balance is only 1k, just used 2 certificates for free nights. Marriott points and Hilton points are used most recently. Points and miles are good to collect, but not for a long time. Devaluations can happen at any times. Use them whenever you can or you need to.