Ironic an e-book with finale' in the title is the last to be a novella, that had nothing to do with my decision.
The reasons for not writing any novellas boils down to sales records and reading tendencies.
None of the novellas I wrote have sold. This includes my original story of The Dockland Murders three years ago.
Modern reading tendencies are for short stories, and my sales agree with the studies done in the USA on the subject.
Also, there is the time Vs income situation. A short story can take a day or two, so, I don't object too much if it bums. A novella can take over a year, and as such is a huge investment in time and energy and I get no return. I do feel sad when a novella crashes, because I get involved with the characters and their lives as I write. I feel I let them down, if the story doesn't get even one sale.
Finally, as I need to re-edit ASL, I have no idea when/if the book will emerge. I am doing the edits for friends, not for sale, at the moment. Perhaps, if sales pick up I may bring it out of the wrapper, perhaps not.