As I said, the gain has no GUI widget for it, so I was setting it via Python. Stefan and I briefly discussed it. His opinion was that Gain is not useful. At the time, I was not able to agree or disagree, so I let it go. Now that I've examined the formula closely and rendered with it, I disagree with him. The Gain is useful. It is not useful if you are doing true [0, infinity] into [0, 1] mapping, but that's not what we're doing. We're mapping, for example, [0, 1] into [0, 1] and for that the Gain is very helpful. Notice the case where I had Gain = 1.11, that is exactly what I did. The range [0, 1] mapped to [0, 1].

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)