I hatw that too. You need the rulebook, battletome, general's handbook, monstrpus compendium and malign sorcery books, each with its own FAQ and designer's commentary just to play a game because the rules are scattered through too many books. It's ridiculous.
I recommend something: after you buy the battletome (or if you have one already, because copyright issues), photocopy the datasheets and the starhosts datasheets, with the rules and point costs from the battletome and the general's handbook, tie them all together and start writing on that all the changes in the faqs. It's really useful having everything there. You still need the books for missions and rules and all that, but at least you keep the battletome clean (i hate writing on the battletomes and codexes).