Why is it a mistake to save those miles for the future? As NerdWallet explains—and as I recently learned—credit card issuers frequently update their rewards programs. Points and miles can lose value, which is why sites like The Points Guy track monthly valuations, and point/mile earning options can be adjusted or eliminated completely.
Take hotel housekeeping, for example. Unless you have cash on hand, how do you tip the people who clean your room and make your bed? USA Today proposes a complicated system in which you first ask the concierge whether any part of your hotel bill, such as the service charge, is distributed to housekeepers, and then “Ask the concierge to increase the amount of the service charge if the hotel automatically includes an amount that you feel is too low.”