[Dunkman]

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I've started playing them regularly short time ago, and my ROI is 190% with 112 tournaments played.

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Obviously sustainable......

They're great $/hr, you "true" ROI won't be as high as a normal tournament, but because people make such large mistakes late I'd argue that your $/hr in these can be higher than a 15 minute blind tournament of the same buy-in if you know what you're doing. Just be prepared for pretty large swings because variance in 50% ROI land can be severe.