Initially thinking for each upvote. This is ideal with small numbers. However if voting contribution and/or tournament winnings are big enough then I think it would be fairer to give extra weight by SP for each upvoter. If that becomes the case I will need to know how to find that information out as I have not done that before. I read about it in my travels but have not utilized it. This may turn in a time to learn about the SP voter weight and utilize it.