I certainly always learn much from exchanges on FR, to a point, and that point is where the same questions are asked, the same answers are given, and the same responses ensue, or when new opinions start appearing seemingly for no other reason than that the other guy said the opposite.
Usually exchanges on FR die a natural death when that happens, but when they don't, I check out of them, rightly or wrongly. You will note that I stay completely out of exchanges on this thread where the same things are being repeated over and over by the same people. It just isn't my cup of tea.
As to the offer of giving you the last word, when I've announced in the past that I'm formally checking out of a particular exchange for a time, I've been accused of wanting to have the last word, and so I've started to try to make a point specifically of inviting others to have the last word when I reach the point where I want to quit. No offense was meant -- I was trying to be polite.
I usually get involved in an exchange either because I think that the pre-fab Orthodox position deserves to be stated clearly at least once, or because I think something is particularly interesting and relatively unexplored on this forum (such as your interesting question about the Biblical basis of Christ's descent into hell.)
What I generally find most interesting are questions of what the Scriptures say, what the Fathers have to say about those Scriptures, and what the liturgical texts of our Church say. But at a certain point, that has been discussed, and then I run out of anything to say and begin to repeat myself. Perhaps I am depriving myself of learning opportunities by taking a break at those points, but so be it.