It would be interesting to see what these numbers looked like for commenting on each front end.

It would be interesting to see that, but it would not be a fair number, since one of the frontends incentivizes comments, by handing out points that can be used to boost, promote your or other users posts. This is driving those who are after earning a few cents out of this.
However, I'd like to see if it makes a difference and if those eager to earn points are more than those who care more about what the frontend has to offer.
@dalz, can you share the statistics for comments/frontends?

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