re: "Can anyone think of any other reason(s) why it has been on/off/on/off? "
Since it was an informal, general discussion, blatantly plugging one's own product, with tedious charts and graphs nonetheless... They might have finally decided it would have been too much. Even presumptuous or a bit unseemly, like one sometimes sees when an author keeps diverting a panel discussion on some general issue to promote his book. "And by the way, It only $19.95. and if you call today, get a set of amazing ginzu knifes, free..." :)
I imagine they discovered that other panelists weren't presenting in that manner, so the level of detail was toned down to be more consistent with the theme of that particular venue.