I thought you had something different in mind, but if it is this, I don't understand in what way is the solution of charging only for immediate replies to bad comments unsatisfactory. When I proposed this variant of the feature in the ticket, the thread you cited was exactly of the kind I was thinking about.

On the other hand, threads like this are rare, so (1) you seem to exaggerate their impact and (2) a month that you've suggested in the ticket won't be enough to see whether the direct-reply-fee solution helps, as we only get a few of these in a year.