The reason why NFT artwork is worth millions isn't just for a speculative market so another chump will buy it from you at a higher price, but it also has another value. Like all artwork it is used for tax avoidance. The high price of NFTs allows a wealthy elite to squirrel away millions to accrue value without being taxed. They are more handy than a real piece of artwork or some expensive property in London because a digital image isn't vulnerable to physical damage or maintenance costs. It's obvious why this shit is exploding.
You also forgot "money laundering".
When I do it, I get in trouble.
When rich people do it, they call it "collecting fine art".