I'm not sure if there are comment bots, but some people sure do look like one. When you check out their comments list, they've posted the same two or three comments on all posts they could find. Maybe it's a bot, maybe it's a person doing it. I'm not sure those kind of comments will get any considerable amount of reward either way.

If upvote bots get used by these people though, it might be different. It could already be put to use today, though. Not sure if a seperate reward pool would matter in that regard.

I'm not pro seperate blog reward pool, btw.