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With 10 rounds per day that could be 1 SBD/steem per day is 7 per week. Which results in 0.7% return on investment on weekly basis.
If my calculation is correct, that is much higher than on the normal stock market or my savings account

your calculations are correct, you can see the payments of 3 Investors who delegated about 1000 SP to @minnowhelper. (thorheit, mynaturebody and truconspiracy)

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