Spellbooks would add the dynamic to the game for sure (as it suppose to). If the spellbooks needed at 40+ people will farm them, kill for them, sell them from the start.
Plus, as everyone mentioned it will soften the disbalance between mage/fighter classes in the beggining.
Moreover, it really adds up to the whole old-school feeling of lineage. (even if you memorized every book and it's drop) :D
P.S.
I really hope Admin will think about it. (and ofc add it) :P