It is a collectible. There is no good way to value them.
Bear in mind that once you buy them, the bitcoins are transferred to you and the value decreases.
Permit me. I want to get an understanding does it mean when I get for example a 1btc coin, will the value now decrease to say 0.09btc? Also, I want to ask on the coin, will there be a way to redeem it and covert to the coins we all transfer into our individual wallets? An answer will be appreciated because I have seen some auction done for physical bitcoins which I have require more information.
Nope, it is just that you may pay more than 1 btc (say 1.1 btc) for 1 bitcoin. The 'premium' is only due to the fact that it is freshly mined.
You can always spend it. But you may find it difficult to sell it for 1.1 btc (the price you have paid).