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Coins as in minted silver coins? I have them too as per the picture...If you mean rare coins, like Roman ones, then not.

That coin in the photo is legal tender here in Australia. It's minted by the Perth Mint as $10 Australian dollars and is legal tender to use...Of course, it's worth much more in silver-weight and only an idiot would use it as legal tender. Those are the coins I like, not so much the rare ones although they can be cool.

!ENGAGE 25

Hmm, they might need to be buried for a couple thousand years and found in an archaeological dig before they're considered rare.