Although a lot of coins never changed original owner there is a lot of varity in quality between coins. Over time the high grades will get a higher and higher premium is my guess while the low grades will keep circulating.
I don't think there is much variety in quality between coins of the same mintage. The brass coins will show the most wear because of the metal used. They smudge and scuff easily. The silver coins were all issued after these items became collectible, very few have been spent, none have be used as "change" or real currency, hanging around in your pocket. Majority of these coins have the same level of quality. One potential difference is how straight the first bits appear in the hologram, but that's it!
Yes, they are becoming more scarce by the minute.
Casascius coins are prized and will continue to be since no more will enter circulation.
Why do they get more scarce by the minute? You sound like Trump with that fake news!
So BTC goes mainstream = Casascius more scarce
BTC Price goes to the moon = Casascius more scarce
I appreciate your opinion. How do they become more scarce if the same number exist one day to the next? These coins sit in collections (most of them), they aren't getting used or disposed of!