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yes 20% is good indeed. I was checking that some time ago, and I've not seen much above 15%

@steemhunt returns 20% ROI in terms of Steem, SBD and mostly HUNT token. There are other DApps that shares TOKENs, but not sure about their ROI (e.g. @minnowsupport, @leovoter, @dlike etc.)