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With current rate of $HIVE, U need half a million HP to generate $50 per day in curation

337.41 HP = $165.95 for 50K HP, so 5.5$, you may be right, but it may be slightly lower. 500k HP leads to 55$ per day, on average. So, 455K, not bad.

Thanks for the answer.

Yeah, it was just a approx figure, not with a detailed calculation.

This is a good calculation but the price will keep fluctuating so earning will not remain stable.

Yes always subject to pricing of $HIVE. But for curation rewards, since u generate curation reward in Hive Power, it does not change in terms of HIVE, in terms of USD it could vary.