@eye, i dont think theres any doubt that they use these events as trial ballons of sorts, although typicaly the big 3 day sales conventions arnt trials as some of the talks are printed verbatim to be used as wt studies. The one day events seem to have that 'trial balloon' element (in my opinion) for sure. Something else to factor in though, as in the case of losche, is that they all have their own personal views of things and, as you noted, they feel free to run with them because they are on the GB. The locals tend to run with them because they are GB and it somehow gets codified without actually being written, again as you noted. What i have noticed though is that these sorts of unwritten rules are usually adhered to for a short time frame by the majority, if at all. We also had losche rant to us about football. I was a staunch believer at the time and missed not a game over it. In fact he was laughed at by every male in my congregation, with some suggesting he should be invited over for beer and wings (a local custom during football).
i say all that to agree with you but im not sure how far that type of thing goes in the long run with most dubbies. Even tony tight pants remarks about "spanks" (spandex) faded. Local sisters tightned up for about one workout, seemed to realize the foolishness of it, and reverted to what worked (out) for them. Their insistance on dubbies adhering to whats in actual print has a two edge sword effect in these situations. If they dont read it they tend to see it as having wiggle room (at least locally). This GB may simply not be as powerful as some in the past, at least in as far as having the power to imply and get obedience.
I also have noted that having the locals see them more isnt helping them any either. Instead of the gb being a rare treat and having a 'man behind the curtain' mystic, the locals are seeing them often (on gb tv especially) and its losing its luster.