I disagree with that a lot.
The spellbook should be cheap, even 5$ cheap.

Fighting bots by increasing the price for spellbooks is the wrong way to go about it.

secondly, the entry to the game should be cheap. Clayborns idea with a starter pack option seems like a better way to go about it. I agree that new people should get 5ish packs to start off their journey but not by forcing them to pay more.

offer them a 5$ spellbook and afterwards 3 bespoken options for starterpacks at different prices.