Because Lafite is widely sought after in China. Because of China's large population and huge momentum, Lafite has become the most famous wine in the world, and its price has been rising with the domestic situation.
On the other hand, Robert Parker, the most influential wine critic in the world today, also has a soft spot for Lafite. After 80, he gave Lafite the most perfect score, which is almost unmatched by other fine wines. This is also a factor.