I get your concern and it is a valid one. If a person is not appreciating good comments, there may be two possible reasons.
He has too many comments to deal with and can't possibly handle each one of them. Or he is too busy in something offline. Life has all the stuff ready for people at times.
He is complacent or arrogant enough not to care about his followers or their comments.
If the case is # 2, I would happily unfollow such people and advise others to do the same as well. Following should go where it is deserved and appreciated.
I agree. I do understand that some are flooded with comments and do respect the fact that there is a lot more in life. However point 2 in your reply to me I have found, unfortunately, is all too commonplace. You have always replied to my comments and upvoted them and I thank you for that.