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how the heck would that ever work? it would just set up a new black market and make a lot of folks very angry.
I'm not saying it would "work". I'm saying governments could do it, if they really had it in for coin collectors and/or they wanted to send a message that coin hoarding was evil. They'd probably have to pave the way with several years worth of propaganda before enacting such laws.
Look at Prohibition (of alcohol in America in the 1920s). It's often touted as an example of a failed government policy because it didn't completely stop people drinking - they just drank illegally. However, prohibition "worked" in the sense of drastically reducing alcohol consumption and eliminating its public visibility and social acceptability.
Likewise, prohibiting coin collecting wouldn't make coin collecting go away entirely, but it would drive it underground, preventing people from openly advertising and selling their coins; at the same time, many people wishing to be law-abiding or simply fearing being caught, would comply with the laws and hand their collections and hoards over. If "drastic reduction" is the goal, then "elimination" is a viable strategy.
Believe it or not, there are countries where coin collecting - or at least, certain types of coin collecting - is illegal. In Greece, it is illegal to collect coins older than 1826. The laws have been in place for many decades now and it has become part of Greek culture, being taught in schools that people who collect ancient coins are evil. The policy is supported across the political spectrum; no political party dares disagree with it. People in Greece who continue to collect ancient coins must do so in secret, and would be considered traitors by their family, neighbours and government if they were found out.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis