I'm sure that Narrative will also confront the issue of vote-buying. But it is likely to be less severe there. Since you cannot buy reputation (i. e. voting power) on Narrative, a bot will have to gain reputation first, and it could be not so easy. Also, the difference in voting power between whales and minnows is not so dramatic as on Steem. It does not exceed the ratio of 100:1. So the influence of one particular bot will be limited. And, probably, upvoting a post which other users downvoted will lead to a reputation loss, but I'm not sure.

Also, where do you get the information that the niche suggester receives 10% of the niche sale? I could not find it anywhere.