Good for you, I have never paid for a vote bot service and I never will, it just never made sense to me, and it wasn't like I came here to make money either. I don't even up vote my own posts, in 9 months I've done two by accident.
I did join the @theschoolofminnows and it does utilize votes I have setting around when I am not on here and upvotes other school members, and then when I post something it comes by and upvotes some of my stuff. That is as close to a voting bot as I have come and I did it more to help others more than myself, it is kind of a waste just to let voting power sit idle when people could use your vote.