Why can't we purchase an account that has been inactive for 3+ years?
Because I would purchase Dan and have a wail of a time.
How fair would that be if they were like, off fighting a war and came back like, "I can finally get on BYOND again and it will be just like before Nam!", but no. Some kid bought my account.

Wouldn't be very fair.
This would be HIGHLY open to abuse, it would also make subscriptions and in-game benefits for that key open to being stolen. Never. Gonna. Happen.