"You're really into this aren't you?" He rests his pointer finger against his temple, the leather of his couch squeaking a little as he shifts.

You're getting into these Jujutsu fights for extra money, and extra money only. You care nothing about the boss, or whatever he has in his sick head that makes him love this so much. You aren't "really into this", in reality, you're acting like you're really into this to get a fighting slot.