I certainly never stepped foot into the ToT LFR when clearing ToT normal, it was just too minor of an upgrade. I can't imagine doing SoO LFR to get gear either.
In general, the is no real point. The small ilvl boost for casual guilds isn't what they need to down bosses (They need to work on executing the mechanics better), normal guilds it BARELY is an upgrade, if at all, and for hardcore progression you flat out have better gear already, with the exception maybe being set bonuses or trinkets.