If you only test one thing on read, make it how many conversations reach a second message.
I kept notes for a month on the site because I kept losing track of whether the good profiles are already taken.
If you care about how much is automated versus reviewed, that alone should decide whether the site is worth it.
Before committing time to read, work out whether the good profiles are already taken.
Ended up splitting my time between this and Datewander for this exact use case.