They have basically a single source of revenue AFAIK which is selling cars. They sell X amount of cars per year making $Y. They don't turn a profit. Last year they lost close to $1B mostly because of their R&D costs. They need to either sell more cars (assuming that they can make money per additional unit like they say they can) or charge more for the ones they do sell, or both. Fortunately they are expected by investors to follow the Amazon model so they can get away with it for the foreseeable future.