So, why do they keep this idiotic practice going year after year?
1. Keeps the ordinary J-dub busy.
2. It's easy hours for publishers, so they don't mind. That many fewer presentations to give.
I'd be curious to know whether, since this invitation work began, there has been any marked increase in convention attendance. Same goes for the Memorial-- since the invitation work started, has there been a measurable % increase in worldwide attendance? If the "faithful and discreet slave" thought it was worth all that expense and effort, surely it must have reaped measurable results for the Master.