This domain is technically a trademark "violation", as Playstation and Sony are both registered trademarks of Sony Entertainment, Inc.. I believe if you sell it before receiving a cease and desist email that you will not be liable for anything, however the new domain owner will be responsible for any and all contact to and from Sony regarding the domain. A smart buyer would most likely have you sign a contract agreeing to assist in any legal notices that may arise with the domain, but you never know what any particular buyer will do...