In the first half of 2021, NFTs generated $2.5 billion in sales, up from $13.7 million the year prior. Twitter founder Jack Dorsey sold his first tweet as an NFT, he made $3 million on the sale. An NFT's value is in the eye of the beholder, like any piece of art, its monetary value is up to speculation. Digital artists can raise the value by imposing digital scarcity on their products, including digital artwork.