Fair enough :)
Hmm. I never thought about trying to organize them in a series folder.
I just let Calibre do the default folders by author.
One thing that I want to do is for a few books change the metadata to have just the main author because for a given book of a given series it will concatenate all 15 authors-or-writers-or-helpers-or-whatever, and for that reason that book, the third of 5 books, is in a different folder.
Oh doh, my bad :) Thanks again!