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Very good question, actually, I hadn't yet thought about what kind of fraction. For example in 100 member system, if winning vote costs 100 tokens and you voted with 10 tokens, you lose 9 and get 1 back. If you voted with just 1 token, you get it back. So in principle, you can make profit also when voting for the winning account.

CDS derivatives betting on Robin Hood vote outcomes... :D