Ross Gerber, a longtime Tesla investor, sold half of his Tesla stock but struggles to sell his used Tesla due to a saturated market. The value of used Teslas has dropped significantly, with a Model Y that once sold for $70,000 now worth under $40,000. Increased supply, driven by factors like Hertz offloading 30,000 Teslas and Tesla's price cuts, has pressured resale values. Tesla's once-high residual values decrease as the company matures and scales up production, making its long-term sustainability as a normal car manufacturer more apparent.