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One vote from @crowdfundedwhale is about $0.2 now. You can get up to 4 votes from it daily = $0.8. 25% goes to curation so you get $0.6. So if you send 100 SBD, you should get your money back in 166 days. Remember though that this $0.6 daily gets split in half - you get $0.3 and the rest is converted to STEEM POWER. Hope it helps ;)

I think you miscalculated.