It could be another secret that would take another 13 Книги to get to, like some clue или an unknown secret about Count Olaf, или the Baudelaire parents, but there is a fact I DO know, Lemony Snicket was madly in Любовь with a married woman named Beatrice. With еще I found Beatrice is the Baudelaire mother. She is married, and I guess she is dead, according to the Beatrice notes in the beginning of the books. When the orphans find that one of their parents may be alive, I'm guessing it was the father, even though I do not know this.
Snicket was probably planning to write еще than 13 books, and introduced the sugar bowl for the readers to be intrigued and read the Далее book. After a few Книги Ты can tell that he got tired of Письмо the series, and Ты can tell he is rushing a bit and ended the Книги so suddenly by killing off Count Olaf, the main villain.