Well the fact that someone (random) is playing on your account and can be a scrub, noob or w/e just scares me so I would actually let it be and in worst case delete it.
It's true in the words Drakedog said to the admin when he deleted his account once in 2006...
"This movie is the real thing, I have spoken to Drakedog personally. When I asked him; "Why did you delete you character? Why didn't you try to sell it? It could be worth a thousand dollars or more", he replied; "That's not ee style.. I played evil drakedog". True greatness...
Lesson learned: You can't put a price on pride. Rest in peace.. "
Link: http://warcraftmovies.com/movieview.php?id=14524
And yes I know DD is back, dah