Why did Gray Beaver stay so long at Fort Yukon?

Gray Beaver stayed at Fort Yukon for an extended period primarily due to his reliance on the trading opportunities provided by the fort. The presence of traders offered him access to goods and resources that were valuable for his livelihood and that of his tribe. Additionally, his interactions with the traders allowed him to establish important relationships and gain influence within the region. This strategic positioning helped him navigate the changing dynamics brought about by increasing contact with European settlers.