Coin collecting has come crossover with other hobbies like stamp collecting or antiquing in the sense that these hobbies involve people seeking out everyday items that have managed to increase in value over time, no matter their original value.
When a single coin is minted among thousands, tens of thousands, or millions, the odds that it will become very valuable over time are small. However, as we discussed before, coins can be struck with errors, they can be melted down, or otherwise be lost to time, with the result being that a once common coin becomes very rare. People will pay a great deal of money for rare coins. The same is true for everyday objects, and some of them are very coin-like so they have quite a bit of overlap with coins.