You’re right about printing costs. So far no takers on the paperback of How to Write a Book. It’s only $5, but my profit would be about 84 cents! Compared to 35 cents profit on 99 cent purchases.
You should definitely start publishing those stories on Kindle. It opens up a whole new world and you learn a ton. “Boxed sets” seem to be where it’s at for fiction authors so the sooner you publish your first short read, the sooner you can publish your fifth!