Low borrowing rates allow cheap speculation on NFTs. The artificial scarcity of particularly well marketed NFT "collections" means their value will appreciate. The NFT can itself be used as collateral for a loan. That new loan can be used to pay back the original loan used to buy the NFT in the first place. And since the boom is happening your NFT from the scarce and popular collection will continue appreciating in price. If you were smart and bought 10 NFTs from the exclusive collection you could pay off the original loan from the sale of, or a loan collateralized by, just one of the NFTs, giving you a net 9.
Start factoring in tax write-offs or whatever and who knows.
Now eventually this falls apart, but as long as loans are cheap people can keep this up for quite a while. It's quite amazing that someone spent half a billion dollars on even an original, "lost" da Vinci: https://luxe.digital/lifestyle/scene/most-expensive-painting...