I haven’t given much thought to it but I am not sure one person downzapping your content would make a huge deal. Maybe you would get knocked down a spot. 

grayruby

Have you learnt the art of Zapping?

BitcoinAbhi

Do you think that the leaderboard may lead to a strategic downzapping? If someone is higher in the leaderboard and someone, placed down the list, downzaps the post/comments of former  , could this lead to the latter to gain positions? 

Perhaps it would be better to avoid the leaderboard and just get the surprise the following morning, based on your activity in SN. It would be more anonymous too. 