that's a nice idea but I am not too sure if it fits into the Steemit plan - recently Giveaways etc. are flagged seriously...
Another aspect: you just see the 20 upvoters with the highest vote in the pulldown list - you will have to tell people using external sources to find out all upvoters before them like this one https://steemd.com/@fun2learn
This post is stopped and I am not going to organise such game again as I found out that it does not satisfy steemit rule even though many are doing it. So no more upvoting game. I understood and have already decided not to organise such upvote game ever again. I was ignorant as I was new. I ever saw one more senior member who went -18 for reputation rating. I think it all started with a game like that. Only contests that does not require upvote and resteem are allowed after reading the FAQ.