Doesn't want to waste skill points for skills that are gonna become useless after he gets the book?
Fucker already did just that in the raid fight by getting that direct slash skill when he could simply have done that disarm/rampart combo.
You really need to turn your brain off reading this...
Only 12 chapters in and the 2 heroine's background got retconned already. Going from being third daughters with low future prospect which was the reason they were attending the school to begin with to being First daughters qualified to be married.
The synopsis is wrong anyway as it implies he discards Hero, Demon Lord and Sage for Slave merchant while in reality he simply chose Slave merchant as his main job which can be appraised. He still gets the other 3 though hidden from other's eyes.