I truly believe what you give comes back to you. Often wealthy people are generous, and those who are too stingy with giving never seem to get out of being poor. We give a lot and not only do we feel good for giving, the one who receives feels good, and the relationship is happier, and I believe it comes back to us--we get random stuff given to is a lot 😊. The Bible says to be a cheerful giver, so I think if you are giving out of obligation, you won't have the same outcome as if you are giving because you truly want to.
Anyway, I don't think being mustachian means you should stop giving. Also you can give time, etc, not just physical goods.
Wouldn't the world be a lovely place if everyone gave? In India and many eastern cultures, the old tradition is to seek out people to bring home for dinner or to take care of, because they believe you will be blessed by God for doing so.