I always thought of scrolls as more of a "Magic for Dummies" book series written in simple terms and easy for anyone to read and use in a pinch. On the other hand, I always pictured spellbooks as more complicated arcane shorthand that only Wizards could interpret. Even sorcerers can't learn spells from spellbooks.
I don't like the idea of a Wizard risking losing their spells over a one-time use scenario. It's like having a miniature version of Disjunction happen to your spellbook. If things go south, boom, your spell is vanished from existence. Since you lose the pages, you can't simply rewrite the spell back into your book because now there's no more room unless you haven't used all 100 pages yet.