We can't all be doing it, but influencers would love that feature. 

Sort replies by zaps for the parent note & if you don't zap it at least 5 sats, I won't even see your reply. Good for the fans & good for the influencer. 80℅ of the reply guys are immediately excluded. 

Keep in mind that replying is a way that new users can get noticed. Most people not using nostr also have zero sats. We can't all use zaps as a filter.