Final answer:
Zappos maintains its culture through a careful interview process to assess fit, leadership from the CEO, and sustained sales growth.
Step-by-step explanation:
The key to Zappos maintaining its unusual company culture can be attributed to several factors, but primarily it is the interview process that measures fit, ensuring employees align with the company's core values. While the acquisition by Amazon.com could have threatened the distinctive culture of Zappos,
the CEO's involvement and emphasis on maintaining their unique office environment seem to have played a significant role in preserving it. Additionally, the consistent sales growth signals a successful synergy between the company culture and business performance.