Costco has announced a controversial policy change that has unexpectedly resulted in a positive impact on its stock performance. The company's shares have shown a surprising benefit from this unpopular decision, which comes at a time when membership fees are set to increase. This change has sparked discussions among shoppers regarding the implications of the fee hike. Notably, Costco's stock performance has significantly outpaced that of Berkshire Hathaway since the latter sold its stake in the retailer, with Costco's shares more than doubling in value compared to Berkshire's performance.