>The ideal set up in my mind would be four books
I prefer one core book with system, basic setting, basic items, magic and character creation. Then other books expanding items, magic, flora and fauna, and history.
But the flare of the world should be in the first book. You get your taste you start off then you want more.
Price of core book E35-40. Other books E30-40.
Oh yes. Make the world seem very very expansive. Make the reader want to run around and explore everything. Hint at mysteries for the gms to make up. Bring out books on those hints later if you want.
My main problem with some books are they dont inspire me, I have to see the potental and do all the work. I have to make the worlds seem a huge thing and the players feel a area 100 miles by 100 miles is massive.
I love the Idea of a flore and fauna book. Bestiarys are all the range but flicking from a poisous plant to a flying monster to a healing planet sounds wonderlful. Also you could use old flora and fauna books as inspiration.
World maps are nice but unneccessary, you can make your own, and I think they limit a starting setting book.
Exotic, exotic exotic. Odd customs, races, landscapes, please. Steal from ancient history, videogames and make your own.
Oh make clothes, perfumes, weapons, incenses, jewellary, weapons, poisions, soaps, runes, languages, hairstyles, travelling equipment, different types of houses, boats, flyingships, travelling animals, swimming ships, stable foods, drinks, festivals, holidays, fairs, music, famous songs, art, plays and stories. Make the players feel like every village is a different world with new quests, love interest and items.
Let them wander from wonder to wonder, have to sometimes learn a new language to speak to the flower seller who they like.
Give a bonus for building allies, friends and family.
Now im giving away my own secrets so I better stop.