and I saw this (which gave me this idea):
Will there be books in game, and if so, will the number of books be comparable to the number in past games? – By Emmy Mariner
There will be more books in ESO than in previous Elder Scrolls titles, including some that you’ve seen before – if their inclusion is appropriate to the Second Era.
In SWTOR there where cubes (some easy to find some hard to acquire). The books in this game could mimic that, it would add another layer of mini games for people who want's to min/max their character or just do something to pass the time. Obviously the stats would be minor depending on the rarity of the books, it worked well in SWTOR, I hope you, Zenimax, would consider doing the same.