That's what we're finding out in real time. A house signifies a one time purchase for a builder, whereas a Tesla is not only a moving advertisement but normally comes with a subscription service for maintenance and support, so the connection to and enablement of the company continues after purchase and through use.

Selling your house also wouldn't affect the power of the builder because his payment comes as a single packet after completing the contracted work, whereas Musk's power is supported by the stock value of his various companies and Tesla's stock price is connected to the value of their cars which is in Oost predicated on having a good resale value. If people rush to sell their Teslas then these values are negatively affected.

Finally the question about the builder is A) hypothetical while the Tesla situation is actually unfolding before us today, and B) aan unfair comparison because it's unlikely a tradesman will amass so much influence that his "unsavory" acts could lead to changing the power balances in warzones, shaking the foundations of American democracy, dismantling the relations that our treaty and security organisations are built upon etc etc etc.