The quality and the dept of interaction varies, along with the purpose and the number of their audience (due to the limit of time, those with alot of followers may have to make fewer replies to more people, and those with less can make more replies to few people)
Here is a recent curation replies report to give you a clue base on the replies and curation of their comments, etc.
I saw, but it seems to identify weird ones, like burnpost and other bot-looking posters.
It shows you that quantity is not necessarily quality, but it does have a few good examples that are not just about individuals, like you look at the community account comedyopenmic, they interact alot with many of their readers