I remember someone sold his Gunbot license a few weeks ago. He did not disclose his reasons why he is selling his license but you can ask him directly here is the link to the for sale thread https://bitcointalk.org/index.php?topic=1781436.msg17765284#msg17765284 and here is the link to his profile so you can send a PM https://bitcointalk.org/index.php?action=profile;u=843526

I think its good for those who plans to start with trading but you can earn more if you do it yourself.