Probably because it was something he can make 5M dollars in a year doing. Even if he thought he was done, its hard to turn down the money, what else can VD do to make cash? There are not that many 5M dollar a year jobs out there. And don't think he is the the exception to sign a contract at the end of their career knowing they are not likely to play much, it happens all the time and is one of the things GM's need to think about/consider when signing guys.