It's really frustrating that I can sell it for coins but not exchange it for the equivalent number of frags. This punishes players who worked hard to get the frags necessary to breakthrough skills.

This should answer your question to save books: https://forum-narutoen.oasgames.com/page/show-post-24350-1.html

Yes, it is true that there's is a way to exchange it to make other skillbooks but not now at the very least. If you are willing to be patient until the update to the skillbook system we have, you'll be able to do so.

would it be the skill book of the same ninja only thou?

I'm almost done with Naruto as a whole so...

I haven't tried it with 100% confidence since I can't understand mandarin but there's going to be a Tsunade NPC for the skillbook system. To craft skillbooks, there's an instance via Tsunade where you can farm materials to use for the exchange system that looks like a slot machine. I've only used materials to craft a skillbook but never used a random skillbook to craft but the system was able to accept it as a material. As long as it doesn't give me back the same skillbook that I used as a material, I would be fine with it but knowing other games that have a crafting system it can happen -_-

ninja skills can be profitable , but after proper consideration of principles. You may learn from tutorials and can easily apply on some moving dummy toys. You may also use old bags, sand bag, etc.

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have a great time.

Ninja is the best way to defend.. cheers