The problem with all of your examples is they still only sell one thing. Tesla now sells 2 things. That means sales, marketing team, strategy, support, for 2 things. Like, having 2 companies.
Another example, Standard Oil: don't just sell the oil. Refine it, and sell the kerosene, and the lamps, and also sell the gasoline, and when you're left with paraffins invent paraffin candles and sell those too...
Ha! The aboriginal Americans have nothing on Standard Oil. They just used every part of the buffalo. Standard Oil invented uses for every part of the oil.
