There is definitely a major gain to investing in silver and gold coins. For many have made it something they keep for the rest of their lives. In the absence of anything in their possession, these individuals have started collecting coins, one at a time, using their hard-earned money as they have watched their collections grow slowly and steadily.
The same people are aware that their collection of coins has turned into a second investment for them since they stand to earn decent profits when they decide to sell portions from their collections. Everybody knows that buying gold, silver are two commodities that are scarce and demand is constantly growing. Therefore, the fundamentals of economics are applicable here.
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The history of the world suggests that the reason the people collected coins was that they were aware they would appreciate in value in the near future. They also passed on this knowledge to their children and thus many are now inclined to collect silver and gold coins.
Another benefit is the possibility of melting silver or gold and transforming them into different kinds of goods like jewelry. Countries like India like to wear jewelry and there are a lot of people who have converted gold from one form to another. This means you can do the same if you do not have the funds at the moment to purchase ornaments, for instance.