Hi,
I have only posted a few deals and although I think they are good deals (otherwise I would not have posted them in the first place) and would vote +1 anyway for them, the deal automatically gets a positive vote from me as soon as it is published!
I have noticed that other deals have 0 votes, so others must not have that automatically set up?
Can I turn it off?
No, why would you post something that you don't think is a good deal? Why do you even want to turn it off. Sounds pretty silly to post something that you wouldn't give a positive yourself.
Deals posted by reps don't automatically get a +1, as he is a rep of the store it may not be a good deal in that he is just trying to promote his store.