Also, why do you believe it would incentivize a user to sell an account that holds permanent value?

My original thought was that it would more likely incentivize one to keep the account, and use it more, because you have a permanent stake. I do think if there were a way to destroy the burn address so that if an account were sold, that it would not provide incentive to sell the account, but to double down on retaining and using it because the only way to get the value back out of it is by use since you cannot liquidate. Because even current Hive Power can be powered down and liquidated.

If I didn't have that option to liquidate, I feel like it would incentivize me to work through the problems on Hive and really try to add value to the space so that I can continue reaping the rewards of PHP.