For Deletes, the "Popularity Score" (question score + top-scored answer score) determines the number of delete votes required.
votes = max( 10, 3 + popularity / 20)
I've been concerned about that "cost of deletion" when placing first DVs on questions, for example when trying to focus on questions that can be deleted by just 3 users.
Being able to filter by the popularity score would help.
Being able to filter by # delete votes required would be really cool!
Ref