I'm in chapter 1 of Betrayal at Krondor and I already have a number of skill books. After reading them once on each character, they no longer have much of a effect, and I found out that I can sell them back to merchants for a lot of money. Since I don't know how the game's chapter structure works: Do I get new characters later to use these skillbooks on (and keep my inventory for that matter), or should I sell them back or should I sell them back after using them on all three characters in chapter 1?