I think what Elon has missed with his $250K appreciating asset claim is...economics. His math is based on some possibly dubious assumptions, but it's probably solid math and he may even believe it. The problem is (as someone pointed out above), if a new Robotaxi TM sells for $50K, there is no way a used one will sell for more than that. The flaw in Elon's math is that as more and more and more $50K Robotaxis hit the streets, the revenue available for each will decline so that there's no longer a free lunch in buying $50K Robotaxis. At this point (and at every earlier point), a used Robotaxi will sell for less than a new one. And it will no longer be an appreciating asset, assuming there's no enforced scarcity of new Robotaxis. The guy that benefits (the most) in this scenario is the guy building Robotaxis. Thus, it's possible that Elon's math is, first and foremost, self-serving. An interesting corollary, if Elon pulls off the Robotaxi idea, is what happens to the value of ordinary cars that aren't Robotaxis. One would expect them to fall in value.