Now and then someone hears a rumor that the GB might go with 12 members instead of the 8 (or now 7) they currently have. The value of 12 is understandable, which might even drive the rumors every time they plan to add another 4 or 5 new persons to the GB Helpers list. Of course, a rumor that steals their thunder may also promote a delay, even if true.
I'm sure this quote from the Watchtower was previously commented upon as a good explanation for the Watch Tower's best reason to leave the number at 7 or 8:
*** w09 6/15 p. 22 par. 10 The Faithful Steward and Its Governing Body ***
Although all spirit-begotten Christians engaged in the preaching work, only a very limited number—just eight different men—were used to write the 27 books of the Christian Greek Scriptures.
The Watchtower article's title discreetly removed the word "discreet" from "faithful and discreet slave" going with "faithful steward" instead. That seems fairly appropriate while drawing this particularly indiscreet comparison.
But I found a very interesting deuterocanonical verse when reading Ecclesiasticus 37:13-14 (not Ecclesiastes) in the section on "Advisers" that starts out in verse 7 with "Any adviser will offer advice, but some are governed by self-interest." The section ends this way:
Finally, stick to the advice your own heart gives you,
no one can be truer to you than that;
since a person's soul often gives a clearer warning
than seven watchmen perched on a watchtower.
Sounds like good advice, indeed!