I like the idea of a writing skill, however you should ONLY be able to copy level 1 books. Nothing higher. It wouldn’t devalue the system. The economy is already inflated. I can go to numerous shops and see over 50+ books for sale from the pros of mystera. They dive to level 200 UW or kill skelly king and farm books, the prices are dropping even on underpopulated servers. I don’t think being able to copy tier 1 books would be bad. Heck, add a small chance the book gets destroyed in the process and the higher level writing, the better chance of success vs failure.
Level 1 Writing – 5% Success, 10% Failure, 85% nothing. Like Knitting.
Level 100 Writing – 99% Success, 1% failure.