The publishing house, Tor, may have wanted to reissue the first six books and add new material and make lots of cash. I'm sure they'd love to have WoT plushies and bobbleheads and spin-off books written by Timothy Zahn, also.

You confuse the goals of a profit-minded corporation with those of Jordan, however. This doesn't seem right at all, conflating them both as if you were saying that Robert Rodriguez had the same goals for making a movie as the Weinstein brothers and Miramax (when they owned that studio). The last example involves 3, maybe 2, players, all of whom might have different agendas/intentions/etc.

More importantly, though, you ignore everything we know about RJ. You could say that his WoT material doesn't necessarily reflect his ethics, but the man also wrote a lot of Q&A and other material, and his attitude and world-view come across neatly in *those* writings...

You could tell by the way RJ expressly limited the number of "outrigger" books he intended to write. He specifically disclaimed writing about the AoL because he felt he'd already said everything he wanted to say about it. A money-grubber, like George Lucas, for example, would not have been satisfied in that way. There would've been the WoT version of "Yo Da Man" cups at Burger King...

Simply put, RJ was not in any way the sort of person who would stretch out a series just to make more cash. Even putting aside my (and others' sense of his character as a person and an author, you can look at other factors:
(a) RJ had already made a mint off this series, so he didn't need to scrounge for more; (b) RJ already had at least one further series in the planning stages, and he was eager to move on to it when he could; (c) RJ was the sort of writer who would not have seen any advantage, from a quality perspective, to making his series longer just to sell more books.

In fact, on point (c) alone, RJ might have stood firm - stretching it out for any other reason than telling the story "properly" would have been deemed wasteful and probably harmful.