I haven't seen them lately, but OCDB (I hope I got those letters in the right order) and Cureangle were doing huge downvote trails for $35 ish dollars for a while. They were focusing on what they deemed as "Circle Jerkers", but in many cases they were just people who had built a network and a following.

Now, I don't mind that those people got downvoted, what I did mind is by how much and the attitude and name calling that went along with it. Also, in some cases I thought it was too harsh.