That could work as a small minigame! But it could also work like a normal game where you could exchange the tokens you win on the leaderboard for upvotes instead of sharing profit.
I play GemCraft - Frostborn Waith, on steam. I don't get anything out of that :D
Same with Idlemonsters on my phone, no profit for playing that.
Its just a Hive Mindset that we have to make something from the games we play :D