Decimal stamps issued by Australia since 1966.

That's exactly why I stopped collecting U.S. stamps in 1993, it is clear that many, if not most, postal issuing entities are just screwing the collectors by putting out tons of stamps and making a buck off the completists. Personally, I don't care if virtually all stamp issuing entities vanished tomorrow. I don't use the postal system, I probably go through less than a book of stamps a year and really have no interest in modern stamps, they're ugly, mass-produced rip-offs. If they all went away, there would still be millions of stamps to collect, I'm satisfied with that.