3. BMW 507
The BMW 507, produced between 1956 and 1959, was a luxury roadster that captivated celebrities like Elvis Presley. Despite its allure, high production costs and limited appeal led to only 252 units being built, causing significant financial losses for BMW. Today, the 507 is recognized as one of the brand’s most coveted classics, with surviving models fetching millions at auctions. (cnbc.com)