I just was in a long conversation about this and other what I'm calling "faith based investments". To me it all fits into art. A painting doesn't have much material value, just the exclusivity of having it. Same with digital investments.
If I was younger I'd consider putting 10% or so in NFTs, crypto, etc. But my current glide path doesn't have much room for pure speculation beyond some single stock purchases to augment my ETFs and Mutual Funds.