The government always forbids the use and play bitcoin so that it can not grow fully potential in my place. Surely it remains an advantage if there is a transaction rotation for bitcoin in my country to live.
I think the obvious reason would be they need the money or have achieve their goal already. Most people do not want to take further risk and its a good attitude when it comes to gambling, though its different from bitcoin investment I think it is reasonable for them to sell it based on their own earning goal. Though I would also perfer to hold it and keep it up until it somehow reach a tremendous amount.