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Curation projects focussing on finding undervalued content will never be able to beat this number. The returns stated here are only possible by automating votes to get on authors that regularly do well with their posts as close to the 5 minute window as possible. I would even say that's not curation at all, just profit optimized voting.

I don't know. So far I only know of 1 such project and that is https://steemit.com/@curangel. I'll keep an eye on it.