Originally Posted by VydorScope
I get complaints that the text is to small at 10 point from readers. So I do not think I would go to 9.5 personally.
It does make a difference which font, though. Palatino/Book-Antiqua seems to be a lighter font with a smaller relative 'x' height than Georgia, which prints quite dark. Line spacing can also make a big difference on clarity. For example I prefer 9.5pt over 10pt at my current line spacing (0.43cm/12pt) - and to expand the line spacing to make 10pt look good blows out the page count further than I wanted.
It's a touch choice. I like the way it came out at 10.5pt, but I'm worried it will push the price too far out. I can offset some of that by reducing the amount of discount, but if I go too far in that direction it limits who will list the book.