So I've seen that can-superconductors are selling YBCO bulks (example: https://www.can-superconductors.com/levitation-bulk.html ) My question, however, is: What are its buyers? Who buys this product other than curious enthusiasts who want to witness the levitation of this material by themselves? Is there any useful application of these bulks in real world? Any commercial use? Is it profitable to make them? I'd appreciate any kind of input.