Maybe it depends on the mod you're playing. I think nowadays Shattered is the most popular. It's at least the one I'm always playing and that only does scroll effects.
It's nice to gamble for scrolls, like Prismatic Image or Divination. And when it's on level ten I transform it to something more useful.
I’m talking about Shattered, I never really played vanilla, because it was too hard and I hate when stuff wears down.
I remember that I always skilled that skill when found that book. Though I keep it, it’s quite useful for my warlock. Prismatic image and recharging my wands and artifacts are nice. Recharging artifacts is especially nice for artifacts that only charge with XP.