"Also, people comparing the cost of this roof with the cost of a conventional roof are being a little ingenuous." Because that's precisely what elon did! "“So

"Also, people comparing the cost of this roof with the cost of a conventional roof are being a little ingenuous." Because that's precisely what elon did! "“So the basic proposition will be: Would you like a roof that looks better than a normal roof, lasts twice as long, costs less and—by the way—generates electricity?” Musk said. “Why would you get anything else?” " Note the "Costs less" part. In case you wanted to argue about that: "Musk told the crowd that he had just returned from a meeting with his new solar engineering team. Tesla’s new solar roof product, he proclaimed, will actually cost less to manufacture and install than a traditional roof—even before savings from the power bill. " Note very specifically: "Cost less to manufacture and install than a traditional roof - even before savings from the power bill".