You should probably add the areas you worked on with that account - a programmer's account, for example, won't necessarily be as much of an advantage to, say, a writer. Also, aren't you concerned about the possibility of your account being misused (intentionally or otherwise), and that reflecting negatively on your business? I imagine some of your old clients might still be reached, or might themselves try contacting the account for additional work.

Finally, and don't take this personally robertlukka, but to anyone interested in this, make sure the account wasn't hacked, and that the account can't be easily returned to the seller somehow.