I think that while downvoting is possible it will only become more common - as the site grows and attracts more people, with more agendas, and more competition

The problem will always be that people see the pending payout and view it as ‘their earned money’, even if there are still 6 days to go.

It is interesting that people view downvoting as taking away from them something that they have already earned, while they don’t view upvotes as giving them something they haven’t yet earned. This will never change