Scott Wallick, the author of the popular and well known Sandbox theme has announced on his personal blog that he is selling the Sandbox domain along with Plaintxt.org. The sale does not include the actual themes since they have been developed and released under the GPL license. Scott does provide a reason for why he is selling the domains:
I have withdrawn from the WordPress community. Active development of my themes and plugins has stopped simply because I am unable to continue the necessary development. In a way, they have a life of their own.
If you would like the opportunity to chat with Scott Wallick about his involvement with the WordPress community, be sure to tune in to this weeks episode of WordPress Weekly as he will be my special guest.