Bitcoin is not a collectible any more than individual gold bars are collectibles. A collectible can be compared in value to another collectible of the same type. I might want a 1979 Dave Kingman card because I'm nostalgic for Dave "Kong" Kingman. Others will buy the Dave Kingman card to sell it to people like me, but we all give the card value based on its condition, the player, the year, etc. But a Steve Macko card…
Gold has inherent value. You can melt them and use the gold. A better example might be diamonds. They have value, but very little is intrinsic in the actual gem. They are collectibles.